@book { 1300JahreBulgarienStudienzum1InternationalenBulgaristikkongressSofia1981Teil2BulgarischeSammlungBd3,
    title = "1300 Jahre Bulgarien. Studien zum 1. Internationalen Bulgaristikkongress Sofia 1981. Teil 2 (= Bulgarische Sammlung, Bd. 3)",
    author = "Wolfgang {Gesemann} and Kyrill {Haralampieff} and Helmut {Schaller}",
    year = "1982",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12584",
    url = "https://www.peterlang.com/document/1067035"
}