@Phdthesis{sommer2004qfe, author = "Daniel Sommer", school = "PhD thesis at the Universit{\&}auml;t Karlsruhe (TH), Fakult{\&}auml;t f{\&}uuml;r Wirtschaftswissenschaften", title = "Qualit{\"a}tsinformationssysteme f{\"u}r E-Learning-Anwendungen", year = "2004", }