@book { TheEnigmaticTsarandHisEmpire,
    title = "The Enigmatic Tsar and His Empire",
    author = "Alexander {Kaplunovsky} and Jan {Kusber} and Benjamin {Conrad}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15714",
    url = "https://www.peterlang.com/document/1110817"
}