@book { Rannjajaneizdannajaproza,
    title = "Rannjaja neizdannaja proza",
    author = "Michail {Bulgakov}",
    year = "1976",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12778",
    url = "https://www.peterlang.com/document/1067164"
}