?:citationString
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European Commission, Brussels (2018): Flash Eurobarometer 468 (The End of Roaming Charges One Year Later). GESIS Data Archive, Cologne. ZA6938 Data file Version 1.0.0, doi:10.4232/1.13046
(en)
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European Commission, Brussels (2018): Flash Eurobarometer 468 (The End of Roaming Charges One Year Later). GESIS Datenarchiv, Köln. ZA6938 Datenfile Version 1.0.0, doi:10.4232/1.13046
(de)
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