Voelter, Markus
Kolb, Bernd
Szabó, Tamás
Ratiu, Daniel
van Deursen, Arie
Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01/S11014)
Article History
Received: 28 July 2016
Revised: 24 October 2016
Accepted: 18 December 2016
First Online: 9 January 2017