M. Suba, Shanmugapriya R, M.L. Suresh, Karthik S. “Generalized Nonagonal Fuzzy Number and Its Application in Assignment Problem”. Mathematical Statistician and Engineering Applications 71, no. 4 (September 24, 2022): 3506–3514. Accessed December 7, 2025. https://philstat.org/index.php/MSEA/article/view/911.