EditorialBoard, “Sergei Nikolaevich Chernikov (on the 90th Anniversary of His Birth)”, Ukr. Mat. Zhurn., vol. 54, no. 6, pp. 743–744, Jun. 2002, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4111