GOLASINSKI, M.; GONCALVES, D.; WONG, P. Generalizations of Fox Homotopy Groups, Whitehead Products, and Gottlieb Groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 3, p. 320–328, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3600. Acesso em: 27 apr. 2025.