S. D. Ivasyshen and H. P. Ivasyuk, “Correct solvability of Solonnikov–Eidel’man parabolic initial-value problems”, Ukr. Mat. Zhurn., vol. 61, no. 5, pp. 650–671, May 2009, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3048