@book { Perun,
    title = "Perun",
    subtitle = "The God of Thunder",
    author = "Mark {Yoffe} and Joseph {Krafczik}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1096468"
}