@book { PolandtowardsitsSouthernNeighbours,
    title = "Poland towards its Southern Neighbours",
    author = "Przemysław {Waingertner}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17724",
    url = "https://www.peterlang.com/document/1117998"
}