M. I. Matychuk, “Problems for equations with special parabolic operator of fractional differentiation”, Ukr. Mat. Zhurn., vol. 61, no. 8, pp. 1088–1097, Aug. 2009, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3082