Ivasyshen, S. D., and H. P. Ivasyuk. “Correct Solvability of Solonnikov–Eidel’man Parabolic Initial-Value Problems”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 5 (May 25, 2009): 650-671. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3048.