1.
Vasylyshyn PB, Ptashnik BI. A multipoint problem for partial integro-differential equations. Ukr. Mat. Zhurn. [Internet]. 1998 Sep. 25 [cited 2025 Dec. 6];50(9):1155–1168. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4832