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and density estimation, Journal of the American Statistical Association, 
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C. Fraley and A. E. Raftery, MCLUST Version 3 for R: Normal Mixture
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@article{FraleyRaftery2002,
            author = "C. Fraley and A. E. Raftery",
            title = "Model-Based Clustering, Discriminant Analysis and
                     Density Estimation",
            journal = "Journal of the American Statistical Association",
            volume = 97,
            pages = "611-631",
            year = 2002}

@techreport{MclustSoftwareManual2006,
            author = "C. Fraley and A. E. Raftery",
                title = "{MCLUST} Version 3 for {R}: {N}ormal 
                    Mixture Modeling and Model-Based Clustering",
            type = "Technical Report",
            number = "504",
            address = "Department of Statistics",
            institution = "University of Washington",
                year = {2006, revised 2009}}
