@book { DierechtlicheStellungderdeutschenVolksgruppeinPolen,
    title = "Die rechtliche Stellung der deutschen Volksgruppe in Polen",
    author = "Jochen {Hogrefe}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095857"
}