MIHOLCA M. A generalized Ekeland’s variational principle for vector equilibria. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2019 Dec. 30 [cited 2025 Feb. 5];64(4):581–592. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2382