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W. J. Owen, T. A. DeRouen, Estimation of the Mean for Lognormal Data Containing Zeroes and Left- Censored Values, with Applications to the Measurement of Worker Exposure to Air Contaminants, Biometrics, Vol. 36, No. 4 (Dec., 1980), pp. 707-719
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Owen et al. (1980) studied this question.
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