Azizi WM, Hayat A, Shams S, Zulkifly MIE. An Estimation of Underground Economy in Afghanistan Using Mathematical Fuzzy Model Based on Mean and Standard Deviation. J. Res. Appl. Sci. Biotechnol. [Internet]. 2023 Sep. 25 [cited 2024 Jul. 4];2(4):176-81. Available from: https://jrasb.stallionpublication.com/index.php/jrasb/article/view/297