M. H. Nguyen and T. D. Pham, “On the smoothness of the generalized solution of a parabolic system in domains with conic points on the boundary”, Ukr. Mat. Zhurn., vol. 56, no. 6, pp. 857–864, Jun. 2004, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3804