S. D. Ivasyshen and V. V. Layuk, “Fundamental solutions of the Cauchy problem for some degenerate parabolic equations of the Kolmogorov type”, Ukr. Mat. Zhurn., vol. 63, no. 11, pp. 1469–1500, Nov. 2011, Accessed: Apr. 07, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2819