@book { SymbolaeEcclesiasticaeBulgaricaeVortrgeanlsslichdes80GeburtstagesvonHansDieterDpmann,
    title = "Symbolae Ecclesiasticae Bulgaricae. Vorträge anlässlich des 80. Geburtstages von Hans-Dieter Döpmann",
    author = "Helmut {Schaller} and Rumjana {Zlatanova}",
    year = "2011",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12156",
    url = "https://www.peterlang.com/document/1067403"
}