@book { PoliticalGeography,
    title = "Political Geography",
    subtitle = "New revised edition",
    author = "Igor {Okunev}",
    year = "2024",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b22102",
    url = "https://www.peterlang.com/document/1524210"
}