SHARKO, V. V. Morse Functions on Cobordisms. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 1, p. 119–129, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2703. Acesso em: 5 dec. 2025.