Il'kiv, V.S. and Strap, N.I. (2015) “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”, Ukrains’kyi Matematychnyi Zhurnal, 67(5), pp. 611–624. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2009 (Accessed: 14 April 2025).