Variants of the Ekeland variational principle for approximate proper solutions of vector equilibrium problems. - Le Phuoc Hai; Lidia Huerga; Phan Quoc Khanh; Vicente Novo (J. Glob. Optim., 2019)

Ekeland variational principles involving set perturbations in vector equilibrium problems. - Le Phuoc Hai (J. Glob. Optim., 2021)

General Versions of the Ekeland Variational Principle: Ekeland Points and Stop and Go Dynamics. - Le Phuoc Hai; Phan Quoc Khanh; Antoine Soubeyran (J. Optim. Theory Appl., 2022)

Regular Subgradients of Marginal Functions with Applications to Calculus and Bilevel Programming. - Le Phuoc Hai; Felipe Lara 001; Boris S. Mordukhovich (J. Optim. Theory Appl., 2025)