« ON THE COMBINATORIAL PROPERTIES OF NILPOTENT AND IDEMPOTENT CONJUGACY CLASSES OF THE INJECTIVE ORDER-DECREASING TRANSFORMATION SEMIGROUP ». FULafia Journal of Science and Technology , vol. 1, nᵒ 1, février 2021, p. 91-94, https://lafiascijournals.org.ng/index.php/fjst/article/view/15.