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\section{Reference}   1. A.L.Muratov, O.Y. Gnedin, "Modeling the Metallicity Distribution of Globular Clusters", ApJ, 2010 2010.  2. D.W. Muller, G.Sawitzki, "Excess Mass Estimates and Tests for Multimodality", Journal of the American Statistical Association, 1991.   3. B. Efron, "Bootstrap Methods: Another Look at the Jackknife.", Annals of Statistics, 7:1-26. 1979.