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European Commission (2014): Flash Eurobarometer 381 (Small and Medium Enterprises, Resource Efficiency and Green Markets, wave 2). GESIS Data Archive, Cologne. ZA5874 Data file Version 1.0.0, doi:10.4232/1.11869
(en)
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European Commission (2014): Flash Eurobarometer 381 (Small and Medium Enterprises, Resource Efficiency and Green Markets, wave 2). GESIS Datenarchiv, Köln. ZA5874 Datenfile Version 1.0.0, doi:10.4232/1.11869
(de)
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