Do Transaction Costs of Payment Systems Differ Across Customers in E-commerce? - Robert Maximilian Grüschow; Jan Kemper; Malte Brettel (ECIS, 2015)

How do different payment methods deliver cost and credit efficiency in electronic commerce? - Robert Maximilian Grüschow; Jan Kemper; Malte Brettel (Electron. Commer. Res. Appl., 2016)

Managing Payment Transaction Costs at Multinational Online Retailers. - Robert Maximilian Grüschow; Malte Brettel (Int. J. Electron. Commer., 2018)