@book { DieVerfassungsmigkeitvonLandeskinderklauseln,
    title = "Die Verfassungsmäßigkeit von Landeskinderklauseln",
    author = "Ulrike {Pfütze}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086460"
}