Р. А. Хачатрян. (2020). One the Lagrange multipliers rule in problems with the equality type constraints, given by quasi-differentiable functions. Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, Computer Science, Mechanics Series, 132(3), 17–24. Retrieved from https://bulmathmc.enu.kz/index.php/main/article/view/74