BITTIEV, Kh. R. Space-time localization in one-dimensional problems with free boundary for nonlinear second-order equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 11, p. 1554–1558, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4808. Acesso em: 6 dec. 2025.