DAR, Q. F.; HYO, A. Y.; DAR, G. F.; BHAT, S. A.; TALI, A. M.; BHAT, Y. H. Fuzzy Data envelopment Analysis with SBM using ?-level Fuzzy Approach. Pakistan Journal of Statistics and Operation Research, v. 15, n. 2, p. 481-501, 22 Jun. 2019.