HARBOURNE, B. Global aspects of the geometry of surfaces. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 9, p. 5–41, 2010. Disponível em: https://studmath.uken.krakow.pl/article/view/13243. Acesso em: 31 oct. 2026.