PURKAYASTHA, Saugata; GOSWAMI, Dr. Jituparna; DEBNATH, Bhargab. Characterization of a hyperperfect group. MATEMATIKA, [S. l.], v. 33, n. 1, p. 97–103, 2017. DOI: 10.11113/matematika.v33.n1.861. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/861. Acesso em: 29 mar. 2024.