Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/227046 
Year of Publication: 
2018
Series/Report no.: 
WIK Diskussionsbeitrag No. 434
Publisher: 
WIK Wissenschaftliches Institut für Infrastruktur und Kommunikationsdienste, Bad Honnef
Document Type: 
Working Paper

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