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European Commission and European Parliament, Brussels (2015): Eurobarometer 77.4 (2012). GESIS Data Archive, Cologne. ZA5613 Data file Version 3.0.0, doi:10.4232/1.12049
(en)
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European Commission and European Parliament, Brussels (2015): Eurobarometer 77.4 (2012). GESIS Datenarchiv, Köln. ZA5613 Datenfile Version 3.0.0, doi:10.4232/1.12049
(de)
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