Using the Nanogonal Membership Function and   Fuzzy Parameters for The Exponential-Rayleigh Distribution of Coved-19. Iraqi Journal of Science, [S. l.], v. 65, n. 8, p. 4566–4575, 2024. DOI: 10.24996/ijs.2024.65.8.35. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11527.. Acesso em: 6 aug. 2025.