@article{KruegerJudt2013, author = {Kr{\"u}ger, Malte and Judt, Ewald}, title = {A European card payments scheme : Forever a phantom?}, series = {Journal of Payments Strategy \& Systems}, volume = {7}, journal = {Journal of Payments Strategy \& Systems}, number = {4}, issn = {1750-1806}, pages = {344 -- 358}, year = {2013}, subject = {Kartengesteuertes Zahlungssystem}, language = {en} } @article{KruegerJudt2014, author = {Kr{\"u}ger, Malte and Judt, Ewald}, title = {Ein europ{\"a}isches Kartensystem - f{\"u}r immer ein Phantom?}, series = {Cards Karten Cartes}, volume = {25}, journal = {Cards Karten Cartes}, number = {Mai}, pages = {29 -- 33}, year = {2014}, subject = {Bargeldloser Zahlungsverkehr}, language = {de} }