IQBAL, Iram; HUSSAIN, Nawab. Ekeland-type variational principle with applications to nonconvex minimization and equilibrium problems. Nonlinear Analysis: Modelling and Control, [S. l.], v. 24, n. 3, p. 407–432, 2019. DOI: 10.15388/NA.2019.3.6. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/12882.. Acesso em: 29 apr. 2024.