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 2024 Nov. 21];65(8):4566-75. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11527