@book { FormenbildungdesrussischenVerbs,
    title = "Formenbildung des russischen Verbs",
    author = "Werner {Lehfeldt}",
    year = "1978",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12412",
    url = "https://www.peterlang.com/document/1066894"
}