@book { Unternehmensakquisitionen,
    title = "Unternehmensakquisitionen",
    author = "Gunther {Tillmann}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832423551",
    url = "https://m.diplom.de/document/218169"
}