Contato
Universidade de Brasília
Campus Universitário Darcy Ribeiro
Departamento de Matemática
Brasília - DF
70910-900, Brasil
giovany@unb.br ou
giovany_unb@yahoo.com
Telefone do Gabinete: +55 61 31076495
Giovany Figueiredo
Pesquisa
Atividades editoriais
Participou como membro do comitê Científico do ENAMA-Encontro de Análise Matemática e Aplicações de 2011 a 2021 e participa como membro do Editorial Board das seguintes revistas:
International Mathematical Forum
Research and Reports on Mathematics
Demonstratio Mathematica
BVP - Boundary Values Problems
Projetos de pesquisa com financiamento externo, clique aqui.
Relação dos co-autores nos artigos abaixo relacionados, clique aqui.
Dissertação de Mestrado do Prof. Giovany
Tese de Doutorado do Prof. Giovany
Orientacões concluídas
Nível Doutorado
12 Teses de Doutorado em Matemática orientadas.
Nível Mestrado
22 Dissertações de Mestrado em Matemática orientadas.
Nível Pós-Doutorado
6 Supervisões de Projetos de Pós-Doutorado finalizados
Nível Iniciação Científica
10 Supervisões de Projetos de Iniciação científica finalizados.
Orientações em andamento:
Nível Doutorado.
1) Wendy Fernanda de Almeida. Inicio junho de 2022. Previsão término junho de 2026.
2) Karen Sabrina Gomes Viana. Inicio Agosto de 2023. Previsão término junho de 2027.
Nível Mestrado.
1) Angelo Silva. Inicio Outubro de 2022. Previsão de término otubro de 2024.
200) Positive solutions for a semipositone anisotropic p-Laplacian problem, (with A. Razani), BVP-Boundary Value Problems, 2024, 34 (2024). https://doi.org/10.1186/s13661-024-01841-7.
177) Existence of positive solution for a class of elliptic problems with indefinite nonlinearities with critical and supercritical growth, (with Gustavo S. A. Costa and J. C. Oliveira Junior), Journal Advances in Differential Equations, volume 28, numbers 5-6(2023), 347-372.
176) A positive solution for an anisotropic p-q-Laplacian (with A. Razani), Discrete and Continuous Dynamical Systems Series S, 2023, vol 16, Issue 6, 1629-1643.
175) Multiple solutions for an equation with weights and a nonlinearity with arbitrary growth, (with Vinicius P. Bandeira), Complex Variables and Elliptic Equations, 68, 2023 - Issue 6, pages 1008-1020.
174) Multiple solutions for a Schorödinger-Bopp-Podolsky system with positive potentials, (with Gaetano Siciliano), Mathematische Nachrichten, 296-6, 2023, pg 2332-2351.
173) Positive and sign-changing solutions for nonlinear equations with rapid growing weights, (with Marcelo Montenegro), Applicable Analysis, 102, 2023 - Issue 6, pg 1687-1695.
172) Multiplicity of semiclassical states solutions for a weakly coupled Schr\"odinger system with critical growth in divergent form, (with Segundo Manuel Salirrosas), Potential Analysis, 59, pg 237-261 (2023).
171) Existence of solution for a class of activator-inhibitor systems, (with M. Montenegro), Glasgow Mathematical Journal, 65(1), 2023, 98-113.
170) Local mountain pass for a class of elliptic systems without homogeneity on the nonlinearity, (with Segundo Manuel Salirrosas), Minimax Theory and Its applications, 08 (2023), No. 2, 257-284.
169) Degenerated and competing anisotropic (p,q)-Laplacians with weights, (with A. Razani), Applicable Analysis, Vol 102, 2023, issue 16.
168) Existence and concentration of ground state solutions for a class of subcritical, critical or supercritical problems with potential well, (with Gustavo S. Costa), Matematica Contemporânea 54(2023), 123-156.
155) Existence of solutions for a class of non-local problems driven by an anisotropic operator via sub-supersolutions ( with Gelson C. G. dos Santos and Leandro S. Tavares), Journal of Convex Analysis, 29(2022) no. 1.
152) Nodal solutions to quasilinear elliptic problems involving the 1-laplacian operator via variational and approximation methods( with Marcos Pimenta), Indiana Univ. Math. J, 71, 2, 2022, pg 439-462.
Artigos aceitos ou publicados 2021
151) Existence and asymptotics behavior of solutions for a class of semilinear elliptic systems with subcritical growth( with S. C. Q. Arruda and R. G. Nascimento), Asymptotic Anal., 127, no. 1-2, pp 15-34 in 2021.
149) Ground state sign-changing solutions and infinitely many solutions for fractional logarithmic Schrodinger equations in bounded domains, (with Yonghui Tong, Hui Guo), 70 (2021), 1-14 EJQTDE - Eletronic Journal of Qualitative Theory of Differentual Equations.
146) On a planar non-autonomous Schr\'odinger-Poisson system involving exponential critical growth, (with F. S. Albuquerque, J. Carvalho and E. Medeiros), Calculus of Variation and partial Differential Equations in 2021, 60, 1-30.
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145) On multiplicity and concentration behavior of solutions for a critical system with equations in divergence form, (with S. M. A. Salirrosas ), J. Math. Analysis and Appl., (2021), 494, 124446.
144) Existence of positive solutions of a critical system in RN( with L. S. Silva), Palestine Journal of Math., 10, (2021), 502-532.
143) Fast decaying ground states for elliptic equations with exponential nonlinearity, (with Marcelo Montenegro), Applied Math. Letters, 112, (2021), 106779-106786.
142) Multiplicity and regularity results for a class of quasilinear Schr\"odinger equations involving a nonlinearity concave at the origen, (with R. Ruviaro, J. C. Oliveira Junior and E. Moura), Mediterrrean J. Math., 18(2021), 1-19.
141) Positive maximal and minimal solutions for non-homogeneous elliptic equations depending on the gradient (with G. F. Madeira), J. Diff. Eq., 274(2021), 857-875.
140) Concentration, existence of a ground state and multiplicity of solutions for asubcritical elliptic system via penalization method (with S. M. A. Salirrosas), SN Partial Diff. Eq. Appl., 2(2021), 1-30.
139) Positive solutions of the prescribe mean curvature equation with exponential critical growth (with V. D. Radulescu), Annali di Matematica pura ed applicata, 200(2021), 2213-2233.
138) Existence and behavior of positive solutions for a class of linearly coupled systems with discontinuous nonlinearities in RN, (with J. C. Albuquerque and G. C. G. dos Santos), J. Fixed point theory and Appl., 23 (2021), 1-27.
137) Multiple positive bound state solutions of a critical Choquard equation ( with C. O. Alves and R. Molle), DCDS-A, 41 (2021), 4887-4919.
136) On a zero-mass (N,q)-Laplacian equation in RN with exponential critial growth( with M. F. Furtado and E. S. Medeiros), Nonlinear Anal., 213(2021), 112488.
135) Existence of positive solutions for a class of semipositone problems with Kirchhoff operator (with E. Massa and J. A. Santos), Annales Academicae Scientiarum Fenicae-Mathematica, 46 (2021), 655-666.
134) FitzHugh-Nagumo system with zero mass and critical growth (with Marcelo Montenegro), Israel J. Math., TBD, 1-23, 2021.
133) Existence of positive solutions for a class of singular and quasilinear elliptic problems with critical exponential growth, (with Suellen C. Q. Arruda and Rúbia G. Nascimento), Annales Academiae Scientiarum Fennicae Mathematica, 46, 2021, 395-420.
132) Existence of positive eigenfunctions to an anisotropic elliptic operator via sub-super solutions method (with Simone Ciani and Antonio Suarez), 116, 85-95(2021) in Archiv der Mathematik
131) Normalized solutions for an horizontal transmission problem (with Gaetano Siciliano), 100, issue 15 (2021), Applicable Analysis, 3174-3181.
130) Nonlinear perturbation of a periodic fractional Laplacian with supercritical growth (with Sandra Moreira Neto and Ricardo Ruviaro), to TMNA - Topological Methods in Nonlinear Analysis, 58(1), 335-349 in 2021. DOI: 10.12775/TMNA.2020.073.
129) Existence of a least energy nodal solution for a class of quasilinear elliptic equations with exponential growth (with Fernando Bruno Nunes), Funkcialaj Ekvacioj, 64(2021) 293-322.
Artigos aceitos ou publicados 2020
128) Multiplicity of positive solutions for a quasilinear Schr\"odinger equation with an almost critical nonlinearity ( with Gaetano Siciliano and Uberlandio Severo), 2020, 20(4), 933-963, Advanced Nonlinear Studies - ANS
127) Existence and asymptotic behaviour of solutions for a quasi-linear Schrödinger-Poisson system with a critical nonlinearity, (with Gaetano Siciliano), ZAMP-Zeitschrift Fur Angewandte Mathematik und Physik, 71, Article number: 130 (2020)
126) Quasilinear equations involving critical exponential and concave nonlinearity at the origin ( J. C. Oliveira Junior and Ricardo Ruviaro), Milan Journal of Mathematics, vol. 88 (2020). 295-314.
125) Existence and concentration of nodal solutions for a subcritical $p\&q$ equation, (with Gustavo S. Costa), Comm. Pure and Appl. Analysis - CPAA, 19(11), 2020, 5077-5095. DOI: 10.3934/cpaa.2020227.
124) Existence of positive solutions for prescribed mean curvature problems with nonlocal term via sub and supersolution method, (with Antonio Suarez), MMAS - Mathematical Methods in the Applied Sciences, vol 43, issue 15, 2020.
123) Multiplicity of positive solutions for an anisotropic problem via sub-supersolution method and mountain pass theorem, (with G. C. G. dos Santos and Julio Roberto Silva), JCA - Journal of Convex Analysis, 27 (2020), No. 4, 1363-1374.
122) Existence and behavior of positive solution for a problem with descontinuous nonlinearity in RN via a nonsmooth penalization (with G. C. G. dos Santos and Rubia Nascimento), ZAMP - . Angew. Math. Phys. 71, 71 (2020). https://doi.org/10.1007/s00033-020-01296-7
121) A sub-supersolution method for a class of nonlocal system involving the p(x)-Laplacian operator and applications (with G. C. G. dos Santos and Leandro S. Tavares), EJDE -Eletronic Journal of Differential equations, 25, 2020, 1-19.
120) Existence and profile of ground-state solutions to a 1-Laplacian problem in RN (with Claudianor Alves and Marcos Pimenta), Bulletin of the Brazilian Mathematical Society, 51(2020), 863-886.
119) Sub-supersolution method for a quasilinear elliptic problem involving the 1-Laplacian operator and a gradient term, (with Marcos Pimenta), Journal of Functional Analysis. 278-3 (2020), 108325.
118) Existence of positive solution for a fractional elliptic equation in exterior domain, (with Jeziel Correa), JDE - Journal of Differential equations, 268, 5, 2020, 1946-1973.
117) Sub-supersolution method for a singular problem involving Phi-Laplacian and Orlicz-Sobolev Spaces, (with Gelson C. G. dos Santos and Leandro Tavares), Complex Variables and Elliptic Equations, 65, 3, 2020, 409-422.
116) Nonhomogeneous equation with critical exponential growth and lack of compactness, (with Vicentiu Radulescu), Opuscula Math. 40, 1 (2020), 71-92, https://doi.org/10.7494/OpMath.202.40.1.71.
115) Existence and concentration of positive solutions for p-fractional Schrodinger equations (with Vincenzo Ambrosio and Teresa Isernia), Annali di Matematica Pura ed Applicata, 199, 317-344 (2020). https://doi.org/10.1007/s10231-019-00880-7.
114) Existence and multiplicity of positive solutions for a fourth-order elliptic equation (with Marcelo Furtado and João Pablo Silva), Proceedings A. of the Royal Society of Edinburgh, 150, 2 (2020), 1053-1069.
Artigos publicados em 2019
113) Variational methods for Schrodinger type equations (with Gaetano Siciliano and Edwin Murcia) In book: Current Trends in Mathematical Analysis and Its Interdisciplinary Applications, Chapter 16, pg 565. DOI: 10.1007/978-3-030-15242-0_16
112) Multiple solutions for a class of singular quasilinear problems (with Gelson C. G. Santos and Uberlandio Severo), JMAA - Journal Mathematical Analysis and Applications, 480-2 (2019), 123405.
111) Existence results for some anisotropic singular problems via sub-supersolutions (with Gelson C. G. Santos and Leandro Tavares), Milan Journal of Mathematics, 87(2019), 249-272.
110) Solutions to an anisotropic system via sub-supersolution method and Mountain Pass Theorem (with Julio Roberto Silva), EJQTDE - Electronic Journal Quality Theory in Differential Equations, 46, 2019, 1-13.
109) On concentration of solution to a Schrödinger logarithmic equation with deepening potential well, (with Cladianor O. Alves and Daniel C. de Morais Filho), Mathematical Methods in the Applied Sciences, 42, issue 14, 2019, 4862-4875.
108) Existence of positive solution to the equation $(-\Deta u)^{s}+a(x)u=|u|^{2ˆ{*}_{s}-2}u$, (with Jeziel Correa), Calculus of Variation in PDE, (2019) 58:63, Doi/10.1007/s00526-019-1502-7
107) Existence of positive solution for Kirchhoff type problem with critical discontinuous nonlinearity, (with Gelson Santos), Annales Academiae Scientiarum Fennicae Mathematica, Vol 44, 2019, 987-1002.
106) Nodal solution for a planar problem with fast increasing weights, (with Marcelo Furtado and Ricardo Ruviaro), TMNA - Topological Methods in Nonlinear Analysis, vol 54, issue 2A, 2019, 793-805.
105) A critical anisotropic problem with discontinuous nonlineaties, (with Julio Roberto Silva), Nonlinear Analysis: Real World Applications, 47 (2019), 364-372.
104) Existence of positive solutions for a class of quasilinear elliptic problems with exponential growth via Nehari manifold method, (with Fernando Bruno M. Nunes), Revista Matematica Complutense, 32 (2019) 1-18.
103) Existence of positive solution for a planar Schrodinger-Poisson system with exponential growth, (with Claudianor Alves), JMP - Journal of Mathematics and Physics, 60, 011503 (2019); https://doi.org/10.1063/1.5039627.
88) Existence of bounded variation solutions for a 1-Lapalcian problem with vanishing potentials (with Marcos Pimenta), JMAA - Journal of Mathematical Analysis and Applications, 459 (2018), 861-878.
87) Structure of the set of positive solutions of a nonlinear Schr¨odinger equation (with Antonio Suarez and João Santos Junior), Israel Journal of Mathematics, 227, 1, 2018, 485-505.
86) A Sub-supersolution method for a class of nonlocal problems involving the p(x)-Laplacian operator and applications, (with Gelson dos Santos and Leandro Tavares), Acta Applicandae Mathematicae, 153 (2018), pg 171-187.
Artigos publicados em 2017
84) An existence result for Schr\"odinger equations with magnetic fields and exponential critical growth, (with Sara Barile), JEPE - Journal of Parabolic and Eliptic equation, 3(2017), 105-125 .
83) Ground state solutions for a fractional Schrodinger equation with critical growth (with Vicenzo Ambrosio), Asymptotic Analysis, 105, 3-4, 2017, 159-191.
82) Existence of solutions for a NSE with discontinuous nonlinearity, (with Gelson dos Santos) , JFPTA - J. Fixed Point Theory and Appl. , 19(1), 2017, pp. 917-937..
81) Positive solutions for the fractional laplacian in the almost critical case in a bounded domain, (with Gaetano Siciliano) , Nonlinear Anal: Real World Appl., 36(2017), 89-100.
80) Existence of ground state solutions to Dirac equations with vanishing potentials at infinity, (with Marcos Pimenta), JDE - Journal of Differential Equations, 262(2017), pag. 486-505.
79) Existence of least energy nodal solution with two nodal domains for a generalized Kirchhoff problem in an Orlicz Sobolev space (with Jefferson A. Santos), Mathematische Nachrichten, 290(4) (2017), 583-603.
78) An optimal control problem for a Kirchhoff-type equation (with I.Gayte Manuel Delgado and C.Morales−Rodrigo) , Control, Optimisation and Calculus of Variations (COCV), 23(3), 2017, pp. 773-790.
77) Existence of positive solution for indefinite Kircchoff equation in exterior domain with subcritical ou critical exponent, (with Daniel Cordeiro), J. Aust. Math. Soc., 103(2017), 329-340.
Artigos publicados em 2016
76) Positive solutions for a class of nonlocal problems involving Lebesgue generalized spaces: Scalar and system cases, (with Gelson Santos) , JEPE - Journal of Elliptic and Parabolic Equation, vol 2 (2016), pp 235-266.
75) Multiplicity results for an equation involving a nonlocal term and biharmonic operator, (with Rubia Nascimento), EJDE - Eletronic Journal of Differential Equations (2016), 217, 1-15.
74) Existence of semi-nodal solution for a class of FitzHugh-Nagumo type system (with Claudianor . O Alves and Alânnio B. Nobrega ), Monatshefte für Mathematik, 181, 3, 2016, pg. 515-526.
73) Multi-bump solutions for a Kirchhoff problem type (with C. O Alves), Adv.Nonlinear Analysis, 2016; 5(1), 1-26.
72) Multiple semiclassical solutions for a nonlinear Chouard equation with magnetic field, (with C. O Alves and Minbo Yang), Asymptotic Analysis, 96, (2016), 135-159.
71) Existence of solutions for a nonlinear Choquard equation with potential vanishing at infinity (with C. O Alves and Minbo Yang), Advances in Nonlinear Analysis, vol 5, issue 4, (2016), pg 331-345.
70) A class of elliptic equations with singular and critical nonlinearities (with M. Montenegro), Acta Applicandae Mathematicae, 143-1 (2016), pg. 63-89.
69) A multiplicity result via Ljusternick-Schnirelmann category and Morse Theory for a Fractional Schrodinger equation in RN (with G. Siciliano), NoDea - Nonlinear Differential equations and Apllications, 23-2, pg 1-22, 2016.
68) Ground state solution for a Kirchhoff problem with exponential critical growth (with Uberlândio B. Severo), Milan Journal of Mathematics, 84(1), 2016, 23-39.
67) Study of a logistic equation with local and non-local reactions terms (with M. Delgado, M. O Pimenta and A. Suarez), TMNA - Topological methods in Nonlinear Analysis, 47(2016), pg 693-713.
66) Ground states of elliptic problems involving non homogeneous operators (with Humberto Ramos Quoirin ), Indiana University Mathematics Journal, 65(3), 2016, pg 779-795.
65) Solutions for a Kirchhoff equation with weight and nonlinearity subcritical and critical Caffarelli-Kohn-Nirenberg growth(with Mateus Balbino Guimarães and Rodrigo da Silva Rodrigues), Proceedings of Edinburgh Mathematical Society, 59 (2016), 925-944.
Artigos publicados em 2015
64) Nodal solutions of a NLS equation concentrating on lower dimensional spheres, (with M. O Pimenta), "BVP - Boundary Value Problems", issue 168, 2015.
63) Existence of a least energy nodal solution for a Schrodinger-Kirchhoff equation with potential vanishing at in finity, (with J. Santos Junior), JMP - Journal of Mathematical Physics, 56, 0511506. (2015).
62) On a fractional Kirchhoff-type equation via Krasnoselskii's genus, (with Rafaella Servadei and Giovanni Molica Bisci), Asymptotic Analysis, vol 94, n° 3-4, pp 347-361, 2015.
61) Nonlinear perturbations of a periodic Schrodinger equation with supercritical growth (with O. H. Miyagaki and S. Im. Moreira), ZAMP -Zeitschrift fuer Angewandte Mathematik und Physik, 66(5), 2015, pg 2379-2394.
60) Existence and multiplicity of solutions for a prescribed mean-curvature problem with critical growth (with M. O Pimenta), EJDE-Eletronic Journal of Differential Equations", 86(2015), 1-15.
59) Existence of least energy positive, negative and nodal solutions for a class of $p\&q$-problems with potentials vanishing at infinity (with Sara Barile),JMAA, 427(2015), 1205-1233.
58) The sub-supersolution method for Kirchhoff systems: applications (with A. Suarez), Progress in Nonlinear Differential Equations and Their Applications, Contributions to Nonlinear Elliptic Equations and Systems:A Tribute to Djairo Guedes de Figueiredo on the Occasion of his 80th Birthday" 217-227, 2015.
57) Some Classes of Eigenvalues Problems for Generalized $p\&q$-Laplacian type Operators on Bounded Domains (with Sara Barile), Nonlinear Analysis, 119(2015), 457-468.
56) Multiplicity results for an anisotropic equation with subcritical or critical growth (with J. Santos Junior and A. Suarez), Advanced Nonlinear Studies 15(2015), 377-394.
55) Multiple solutions for a quasilinear Schrodinger equation on RN (with C. O Alves), Acta Applicanda Mathematicae, 136, issue 1(2015), pg 91-117.
54) Existence of a nodal solution with minimal energy for a Kirchhoff equation (with R. Nascimento), Mathematische Nachrichten, 288 (2015), pg 48-60.
53) On a nonlocal multivalued problem in an Orlicz-Sobolev space via Krasnoselskii's genus (with J. A. Santos), Journal of Convex Analysis, 22 ( 2015) issue 2, pg 447-464.
Artigos publicados 2014
52) Multiple solutions for a NLS equation with critical growth and magnetic field (with C. O Alves), Milan Jounal of Mathematics, 82 (2014)-2, pg 389-405.
51) Existence of positive solution for a singular system involving general quasilinear operators
(with F.J.S.A Corrêa and A. S. S. Correa), DEA - Differential Equations and Applications, 6(2014), pg 481-494.
50) A generalization of an extensible beam equation with critical growth in RN (with Alberto Cabada), Nonlinear Analysis: Real Worlds Applications, 20(2014), 134-142.
49) Multiplicity and concentration behavior of positive solutions for a Schrodinger-Kirchhoff type problem via penalization method(with J. Santos Junior), ESAIM: Control, Otimization and Calculus of variations, vol 20, issue 2, (2014), 389-415.
48) On a Phi-Kirchhoff multivalued problem with critical growth in an Orlicz-Sobolev space (with J. A . Santos), Asymptotic Analysis, 89(2014), 151-172 .
47) Existence and concentration result for the Kirchhoff type equations with general nonlinearities(with Nonihisa Ikoma and J. Santos Junior), Archive for Rational Mechanics and Analysis, 213 issue 3(2014), 931-979.
46) An obstacle problem in a plane domain with two solutions (with M. F. Furtado e M. Montenegro), Advance Nonlinear Studies14(2014), 315-325.
45) Study of a nonlinear Kirchhoff equation with non-homogeneous material (with C. Morales, J. Santos Junior and A. Suarez ), J. Math. Anal. Applic, 416(2014), 597-608.
44) On existence and concentration of solutions for an elliptic problem with discontinuous nonlinearity via penalization method (with C. O. Alves and R. Nascimento), Zeitschrift fuer Angewandte Mathematik und Physik - ZAMP, 65(2014), 19-40.
43 ) Existence and Multiplicity of Radial Positive Solutions for a Quasilinear Elliptic Equation with Sign-Changing Nonlinearity (withF.J.S.A Corrêa), Acta Applicanda Mathematicae, 129(2014), issue 1, p-23-39.
42) Existence of a least energy nodal solution for a class of $p\&q$-quasilinear elliptic equations (with Sara Barile), ANS - Adanced Nonlinear Studies 14(2014), 511-530.
41) Positive solution for a class of $p\&q$-singular elliptic equation(with F.J.S.A Corrêa e A. S. S. Correa), Nonlinear Analysis: Real Worlds Applications,16(2014), 163-169.
40) Multiplicity of solutions for a NLS equations with magnetic fields in RN (with C. O Alves), Monatshefte fur Mathematik, 175(2014), pg 1-23.
39) Results like Strauss and Lions for a class of Orlicz-Sobolev spaces and applications (with C. O Alves and J. A. Santos), Topological Methods in Nonlinear Analysis, 44, (2014), 435-456.
Artigos publicados 2013
38) Existence and multiplicity of nontrivial solutions for a bi-nonlocal equation (with F. J. S. A Corrêa), Adv. Differential Equations, vol 18, number 5/6 (2013), 587-608.
37) Existence and multiplicity of solutions for a class of $p \& q$ elliptic problems with critical exponent, Mathematische Nachrichten, 286(2013), 11-12, pg 1129-1141.
36) Existence of positive solution for a Kirchhoff problem type with critical growth via truncatio argument , Journal of Mathematical Analysis and Applications - JMAA 401 vol 2 (2013) pg 706-713.
35) On a nonlinear elliptic transmission problem with critical growth (with M. Montenegro), Journal of Convex Analysis 20(2013), 947-954.
34) Multiplicity of nontrivial solutions to a biharmonic equation via Lusternik-Schnirelman theory, (with C. O. Alves), Mathematical Methods in the Applied Sciences, Volume 36, ussue 6 (2013), pages 683-694.