MIHOLCA, Mihaela. “A Generalized Ekeland’s Variational Principle for Vector Equilibria”. Studia Universitatis Babeș-Bolyai Mathematica 64, no. 4 (December 30, 2019): 581–592. Accessed February 5, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/2382.