1.
Akhmetov MU. Periodic solutions of strongly nonlinear systems with nonclassical right-hand side in the case of a family of generating solutions. Ukr. Mat. Zhurn. [Internet]. 1993Feb.25 [cited 2024Jun.2];45(2):202–208. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5799