IVASYSHEN, S. D.; LITOVCHENKO, V. A. Cauchy problem for a class of degenerate kolmogorov-type parabolic equations with nonpositive genus. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 10, p. 1330–1350, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2958. Acesso em: 14 apr. 2025.