ZUBAIRU∗†, M. .; ALI, B. On the nilpotents of the semigroup of partial contractions of a finite chain. International Journal of Mathematical Analysis and Modelling, [S. l.], v. 7, n. 2, 2024. Disponível em: https://journal.tnsmb.org/index.php/ijmam/article/view/158. Acesso em: 12 sep. 2026.