@book { BeitrgezurGeschichtedesArtikelsimBulgarischen,
    title = "Beiträge zur Geschichte des Artikels im Bulgarischen",
    author = "Wilfried {Stölting}",
    year = "1970",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12386",
    url = "https://www.peterlang.com/document/1066874"
}