Variational and Strong Variational Convexity in Infinite-Dimensional Variational Analysis. - Pham Duy Khanh; Vu Vinh Huy Khoa; Boris S. Mordukhovich; Vo Thanh Phat (SIAM J. Optim., 2024)

Second-Order Subdifferential Optimality Conditions in Nonsmooth Optimization. - Pham Duy Khanh; Vu Vinh Huy Khoa; Boris S. Mordukhovich; Vo Thanh Phat (SIAM J. Optim., 2025)

Lipschitz modulus of convex functions via function values. - Pham Duy Khanh; Vu Vinh Huy Khoa; Vo Thanh Phat; Le Duc Viet (Optim. Lett., 2026)