@book { DerBieterwettbewerbumSchering,
    title = "Der Bieterwettbewerb um Schering",
    author = "Matthias {Dukat}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836605946",
    url = "https://m.diplom.de/document/225398"
}