I. D. Pukalskyi, “One-Sided Nonlocal Boundary-Value Problem for Singular Parabolic Equations”, Ukr. Mat. Zhurn., vol. 53, no. 11, pp. 1521–1532, Nov. 2001, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4372