Р. А. Хачатрян. One the Lagrange multipliers rule in problems with the equality type constraints, given by quasi-differentiable functions. vestmathmcenu [Internet]. 2020 Sep. 30 [cited 2025 Apr. 8];132(3):17-24. Available from: https://bulmathmc.enu.kz/index.php/main/article/view/74