1.
Klyus IS, Ptashnik BI. A Multipoint Problem for Pseudodifferential Equations. Ukr. Mat. Zhurn. [Internet]. 2003 Jan. 25 [cited 2025 Dec. 6];55(1):22-9. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3884