Baranetskij, Ya.O., P.I. Kalenyuk, L.I. Kolyasa, and M.I. Kopach. “The Nonlocal Problem for the Differential-Operator Equation of the Even Order With the Involution”. Carpathian Mathematical Publications 9, no. 2 (January 2, 2018): 109–119. Accessed November 22, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/1454.