LUONG, D.-T.; VU THI, T.-L.; DANG, T.-N. A Lagrange function approach to study second-order optimality conditions for infinite-dimensional optimization problems. HPU2 Journal of Science: Natural Sciences and Technology, [S. l.], v. 4, n. 01, p. 20–30, 2025. DOI: 10.56764/hpu2.jos.2025.4.01.20-30. Disponível em: https://sj.hpu2.edu.vn/index.php/journal/article/view/277. Acesso em: 30 apr. 2025.