M. SUBA, SHANMUGAPRIYA R, M.L. SURESH, KARTHIK S. Generalized Nonagonal Fuzzy Number and its Application in Assignment Problem. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 3506–3514, 2022. DOI: 10.17762/msea.v71i4.911. Disponível em: https://philstat.org/index.php/MSEA/article/view/911. Acesso em: 7 dec. 2025.