BalogunF., and TellaY. “A STUDY ON SOME SUBSTRUCTURES OF ORDERED MULTISETS”. FUDMA JOURNAL OF SCIENCES 2, no. 1 (March 14, 2023): 201 - 205. Accessed May 18, 2024. https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1297.