?:citationString
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European Commission, Brussels (2016): Flash Eurobarometer 426 (Small and Medium Enterprises, Resource Efficiency and Green Markets, wave 3). GESIS Data Archive, Cologne. ZA6648 Data file Version 1.0.0, doi:10.4232/1.12564
(en)
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European Commission, Brussels (2016): Flash Eurobarometer 426 (Small and Medium Enterprises, Resource Efficiency and Green Markets, wave 3). GESIS Datenarchiv, Köln. ZA6648 Datenfile Version 1.0.0, doi:10.4232/1.12564
(de)
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