@articleKamm_Kucklick_Schneider_vom Brocke_2020, title=Data mining for small shops: Empowering brick-and-mortar stores through BI functionalities of a loyalty program1, volume=38, DOI=10.1080/10580530.2020.1855486, number=4, journal=Information Systems Management, publisher=Informa UK Limited, author=Kamm, Michael Reiner and Kucklick, Jan-Peter and Schneider, Johannes and vom Brocke, Jan, year=2020, pages=270–286 

@articleBreugelmans_Bijmolt_Zhang_Basso_Dorotic_Kopalle_Minnema_Mijnlieff_Wünderlich_2015, title=Advancing Research on Loyalty Programs: A Future Research Agenda., volume=26, number=2, journal=Marketing Letters, publisher=Springer, author=Breugelmans, Els and Bijmolt, Tammo H A and Zhang, Jie and Basso, Leonardo J and Dorotic, Matilda and Kopalle, Praveen and Minnema, Alec and Mijnlieff, Willem Jan and Wünderlich, Nancy, year=2015, pages=127–139