GOLASIŃSKI, M. Freudenthal Suspension Theorem And James-Hopf Invariant of Spheres. Contemporary Mathematics, [S. l.], v. 3, n. 4, p. 514–524, 2022. DOI: 10.37256/cm.3420221857. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/1857. Acesso em: 3 may. 2024.