@book { EnterpriseInformationPortals,
    title = "Enterprise Information Portals",
    subtitle = "Einführung, Konzepte, Software",
    author = "Calin Eugen {Godja}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832442767",
    url = "https://m.diplom.de/document/219890"
}