Baranetskij, Ya.O., I.I. Demkiv, I.Ya. Ivasiuk, and M.I. Kopach. “The Nonlocal Problem for the $2n$ Differential Equations With Unbounded Operator Coefficients and the Involution”. Carpathian Mathematical Publications 10, no. 1 (July 3, 2018): 14–30. Accessed December 14, 2024. https://journals.pnu.edu.ua/index.php/cmp/article/view/1467.