@incollection{KruegerLeibold2007, author = {Kr{\"u}ger, Malte and Leibold, Kay}, title = {Internet-Zahlungen aus der Sicht der Verbraucher}, series = {Handbuch E-Money, E-Payment \& M-Payment}, booktitle = {Handbuch E-Money, E-Payment \& M-Payment}, publisher = {Physica-Verlag}, address = {Heidelberg}, pages = {307 -- 324}, year = {2007}, subject = {Elektronischer Zahlungsverkehr}, language = {de} } @incollection{KruegerLeibold2008, author = {Kr{\"u}ger, Malte and Leibold, Kay}, title = {Internet Payments in Germany}, series = {Handbook on Information Technology in Finance}, booktitle = {Handbook on Information Technology in Finance}, publisher = {Springer}, pages = {239 -- 256}, year = {2008}, subject = {Elektronischer Zahlungsverkehr}, language = {en} }