1.
Ptashnik BI, Symotyuk MM. Multipoint Problem with Multiple Nodes for Partial Differential Equations. Ukr. Mat. Zhurn. [Internet]. 2003 Mar. 25 [cited 2025 Dec. 6];55(3):400-13. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3914