PURMONEN, V. T. Quasi-parabolic initial-boundary value problems. Annales Fennici Mathematici, [S. l.], v. 6, n. 1, p. 29–62, 1981. DOI: 10.5186/aasfm.1981.0616. Disponível em: https://afm.journal.fi/article/view/134397. Acesso em: 25 nov. 2024.