Y. M. Berezansky, Y. A. Mitropolskiy, and M. K. Shkhanukov-Lafishev, “On a nonlocal problem for a parabolic equation”, Ukr. Mat. Zhurn., vol. 47, no. 6, pp. 790–800, Jun. 1995, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5473