1.
Vlasii OD, Ptashnik BI. A Problem with Nonlocal Conditions for Partial Differential Equations with Variable Coefficients. Ukr. Mat. Zhurn. [Internet]. 2001Oct.25 [cited 2024May12];53(10):1328-36. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4352