Kolomiyets VG, Mitropolskiy YA, Samoilenko AM. The conference “Nonlinear problems of differential equations and mathematical physics. The second Bogolyubov readings”. Ukr. Mat. Zhurn. [Internet]. 1994Apr.25 [cited 2024Nov.24];46(4):471. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5751