Il’kivVS, Strap NI. Solvability of the Nonlocal Boundary-Value Problem for a System of Differential-Operator Equations in the Sobolev Scale of Spaces and in a Refined Scale. Ukr. Mat. Zhurn. [Internet]. 2015May25 [cited 2024Nov.24];67(5):611-24. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2009