YANG, B. The Gauss–Bonnet theorem. Columbia Journal of Undergraduate Mathematics, [S. l.], v. 1, n. 1, 2024. DOI: 10.52214/cjum.v1i1.12909. Disponível em: https://journals.library.columbia.edu/index.php/cjum/article/view/12909. Acesso em: 4 dec. 2024.