I. M. Konet, N. A. Perestyuk, A. M. Samoilenko, and Y. V. Teplinsky, “International Scientific Conference on the Theory of Evolution Equations (Fifth Bogolyubov Readings)”, Ukr. Mat. Zhurn., vol. 54, no. 10, p. 1440, Oct. 2002, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4182