« Products of Nilpotents in Partial Transformation Semigroups Using Digraphic Paths and Chains ». FULafia Journal of Science and Technology 9, no. 1 (mai 8, 2025): 81–87. Consulté le mai 17, 2026. https://lafiascijournals.org.ng/index.php/fjst/article/view/511.