@book { DieGerichtsurkundevonPskov,
    title = "Die Gerichtsurkunde von Pskov",
    author = "Günter {Baranowski}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104909"
}