[1]
B. I. Ptashnik and A. M. Samoilenko, “International scientific conference ‘New approaches to the solution of differential equations’”, Ukr. Mat. Zhurn., vol. 54, no. 4, pp. 575–576, Apr. 2002, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4095