@book { GrundzgederUnternehmensbesteuerung,
    title = "Grundzüge der Unternehmensbesteuerung",
    author = "Michael {Wehrheim} and Ingo {Fross}",
    year = "2019",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220999"
}