[1] A. P. Dempster, N. M. Laird and D. B. Rubin, Maximum Likelihood from Incomplete Data via the EM Algorithm, Journal of the Royal Statistical Society 39(1977), 1-38.
[2] T. Denoeux, Maximum likelihood estimation from fuzzy data using the EM algorithm, Fuzzy Sets and Systems 183(2011), 72-91.
[3] K. Knight, Mathematical Statistics, New York, Chapman & Hall, (2000).
[4] R. Pourmousa, On truncated measures of income inequality from a fuzzy perspective, Iranian Journal of Fuzzy Systems 15(2018), 123-137.
[5] L. A. Zadeh, Probability measures of fuzzy events, J. Math. Anal. Appl, 23(1968), 421-427.