PRISHLYAK, A. O.; MISCHENKO, K. I. Classification of noncompact surfaces with boundary. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 1, p. 62–66, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/337. Acesso em: 16 dec. 2025.