Berezansky, Yu. M., Yu. A. Mitropolskiy, and M. Kh. Shkhanukov-Lafishev. “On a Nonlocal Problem for a Parabolic Equation”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 6 (June 25, 1995): 790–800. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5473.