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European Commission and European Parliament, Brussels (2013): Eurobarometer 75.1 (2011). GESIS Data Archive, Cologne. ZA5479 Data file Version 6.0.0, doi:10.4232/1.11646
(en)
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European Commission and European Parliament, Brussels (2013): Eurobarometer 75.1 (2011). GESIS Datenarchiv, Köln. ZA5479 Datenfile Version 6.0.0, doi:10.4232/1.11646
(de)
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