@book { UnterHammerundZirkel,
    title = "Unter Hammer und Zirkel",
    author = "Benjamin {Schröder} and Jochen {Staadt}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1107609"
}