SKRYPNIK, I. V.; TEDEEV, A. F. The International Conference “Nonlinear Partial Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 7, p. 1007–1008, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4883. Acesso em: 6 dec. 2025.