@book { LeihmutterschaftinDeutschland,
    title = "Leihmutterschaft in Deutschland",
    author = "Roman {Lammers}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b10655",
    url = "https://www.peterlang.com/document/1109802"
}