TCHERNOV, Vladimir. Homotopy Groups of the Space of Curves on a Surface. MATHEMATICA SCANDINAVICA, [S. l.], v. 86, n. 1, p. 36–44, 2000. DOI: 10.7146/math.scand.a-14280. Disponível em: https://tidsskrift.dk/math/article/view/14280. Acesso em: 14 aug. 2026.