PtashnikB. I. and SymotyukM. M. (2003) “Multipoint Problem with Multiple Nodes for Partial Differential Equations”, Ukrains’kyi Matematychnyi Zhurnal, 55(3), pp. 400-413. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3914 (Accessed: 25November2024).