RAY BOBO, E. Groups of Exponent Four. The Journal of the Indian Mathematical Society, [S. l.], v. 33, n. 1, p. 59–64, 1969. DOI: 10.18311/jims/1969/16745. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/16745. Acesso em: 4 may. 2024.