@book { CustomerRelationshipManagementimMCommerce,
    title = "Customer Relationship Management im M-Commerce",
    subtitle = "Potentiale zur Intensivierung von Kundenbeziehungen",
    author = "Holger {Schauenburg}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832453954",
    url = "https://m.diplom.de/document/220954"
}