@book { BulgaristikSymposiumMarburgBulgarischeSammlungBd7,
    title = "Bulgaristik-Symposium Marburg (= Bulgarische Sammlung, Bd. 7)",
    author = "Wolfgang {Gesemann}",
    year = "1990",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12566",
    url = "https://www.peterlang.com/document/1067017"
}