Ali B, Jada MA, Zubairu MM. On Rank of Semigroup of Order-Preserving Order-Decreasing Partial Contraction Mappings on a Finite Chain. IJMSO [Internet]. 2024Sep.30 [cited 2025Feb.6];10(4):1 - 11. Available from: http://ijmso.unilag.edu.ng/article/view/2384