SOME PROPERTIES OF AN EXTENDED r_1-NON DERANGED PERMUTATION GROUP. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 7, n. 3, p. 332–336, 2023. DOI: 10.33003/fjs-2023-0703-2031. Disponível em: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/2031. Acesso em: 12 sep. 2025.