Isah, A. I., Tella, Y. and Alkali, A. J. (2023) “N-LEVEL AND N-UPPER LEVEL SOFT SETS”, FUDMA JOURNAL OF SCIENCES, 3(4), pp. 285 - 290. Available at: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1649 (Accessed: 26April2025).