@book { DieEntwicklungvonMBOUnternehmen,
    title = "Die Entwicklung von MBO-Unternehmen",
    author = "Christian {Mehrer}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832473525",
    url = "https://m.diplom.de/document/222643"
}