N. I. Ivanchov and N. V. Saldina, “Inverse problem for a parabolic equation with strong power degeneration”, Ukr. Mat. Zhurn., vol. 58, no. 11, pp. 1487–1500, Nov. 2006, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3549