@book { DaskollisionsrechtlicheHerkunftslandprinzip,
    title = "Das kollisionsrechtliche Herkunftslandprinzip",
    author = "Alexander {Thünken}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096221"
}