SAVCHENKO, L. I. On the solution estimation of the first boundary value problem for the quasi-linear systems of differential equations of parabolic type . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 3, p. 421–428, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8574. Acesso em: 6 dec. 2025.