@book { DieunwirksameeingetrageneLebenspartnerschaft,
    title = "Die unwirksame eingetragene Lebenspartnerschaft",
    author = "Karsten {Winckler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103297"
}