IVASYSHEN, S. D.; LITOVCHENKO, V. A. Cauchy problem for one class of degenerate parabolic equations of Kolmogorov type with positive genus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 8, p. 1066–1087, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3081. Acesso em: 5 dec. 2025.