@book { eskstupovn,
    title = "České stupňování",
    subtitle = "Degrees of comparison in Czech",
    author = "Jiří {Marvan}",
    year = "1986",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b12312",
    url = "https://www.peterlang.com/document/1066821"
}