@book { OffshoreBusinessProcessOutsourcing,
    title = "Offshore Business Process Outsourcing",
    author = "Gerald {Oppenauer}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832491680",
    url = "https://m.diplom.de/document/224295"
}