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1by Europäische KommissionContributors: “...TNS EMNID, Bielefeld...”
Published 2002
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2by Europäische KommissionContributors: “...TNS EMNID, Bielefeld...”
Published 2005
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Dataset -
3by Europäische KommissionContributors: “...TNS EMNID, Bielefeld...”
Published 2005
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Dataset