@book { DerFamilienbegriffgrundundeinfachrechtlicherNormen,
    title = "Der Familienbegriff grund- und einfachrechtlicher Normen",
    author = "Sebastian Wolfgang {Idel}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099776"
}