Кофанов ВО. The Bojanov-Naidenov problem for the functions with non-symmetric restrictions on the oldest derivative. Ukr. Mat. Zhurn. [Internet]. 2021 Jan. 29 [cited 2025 Apr. 13];71(3):368-81. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/254