Imam AT, Usman L, Idris A, Ibrahim S. Product of Quasi-Idempotents in Finite Semigroup of Partial Order-Preserving Transformations. IJMSO [Internet]. 2024Feb.18 [cited 2024Nov.25];10(1):53 -59. Available from: http://ijmso.unilag.edu.ng/article/view/2046