@book { RegensburgerDeutsch,
    title = "Regensburger Deutsch",
    subtitle = "Zwölfhundert Jahre Deutschsprachigkeit in Regensburg",
    author = "Susanne {Näßl}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093524"
}