T. Kenzizi, “Existence of nonnegative solutions for a fractional parabolic equation in the whole space”, Ukr. Mat. Zhurn., vol. 71, no. 8, pp. 1064–1072, Aug. 2019, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1498