Affiliation: | 1.Department of Computer Science,Aalborg University,Aalborg,Denmark;2.Universit?t Mannheim - Institut für Informatik,Mannheim,Germany;3.School of Business,University of Applied Sciences, Northwestern Switzerland (FHNW),Olten,Switzerland;4.Forschungszentrum L3S,Leibniz Universit?t Hannover,Hannover,Germany |