Abdullah SN, Huessian IH. Using the Nanogonal Membership Function and   Fuzzy Parameters for The Exponential-Rayleigh Distribution of Coved-19. Iraqi Journal of Science [Internet]. 2024 Aug. 30 [cited 2026 Jul. 9];65(8):4566-75. Available from: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11527