@book { TheInternalSecurityintheVisegradGroup,
    title = "The Internal Security in the Visegrad Group",
    author = "Ewelina {Kancik-Kołtun} and Josef {Smolik} and Radoslav {Štefančík} and Sándor {Fekete}",
    year = "2025",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b23014",
    url = "https://www.peterlang.com/document/1576023"
}