Baranetskij Y, Demkiv I, Ivasiuk I, Kopach M. The nonlocal problem for the $2n$ differential equations with unbounded operator coefficients and the involution. Carpathian Math. Publ. [Internet]. 2018 Jul. 3 [cited 2024 Dec. 4];10(1):14-30. Available from: https://vps.pnu.edu.ua/index.php/cmp/article/view/1467