PUKACH, P. Ya. On the problem without initial conditions for a nonlinear degenerating parabolic system. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 4, p. 454–456, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5747. Acesso em: 15 dec. 2025.