1.
Il’kivVS, Ptashnik BI. Representation and investigation of solutions of a nonlocal boundary-value problem for a system of partial differential equations. Ukr. Mat. Zhurn. [Internet]. 1996Feb.25 [cited 2024Nov.24];48(2):184-9. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5346