VASILYEVA, A. B. On some periodic solutions of singularly perturbed parabolic equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 3, p. 359–369, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3312. Acesso em: 5 dec. 2025.