@book { InhaltundGrenzenfamilienrechtlicherVertrge,
    title = "Inhalt und Grenzen familienrechtlicher Verträge",
    author = "Jana {Traulsen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101569"
}