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@techreport{TUW-118520,
    author = {Filzmoser, Peter and Hron, Karel and Reimann, Clemens},
    title = {Principal component analysis for compositional data with outliers},
    institution = {E105 - Institute of Statistics and Mathematical Methods in Economics; Vienna University of Technology},
    year = {2007},
    number = {SM-2007-3}
}