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@unpublished{TUW-200340,
    author = {Filzmoser, Peter and Croux, Christophe and Fritz, Heinrich},
    title = {Robust sparse principal component analysis based on projection-pursuit},
    year = {2011},
    note = {invited; talk: International Conference on Robust Statistics in Valladolid, Spanien; 2011-06-28}
}