@book { NewPoliticalPartiesinthePartySystemofPoland,
    title = "New Political Parties in the Party System of Poland",
    author = "Josef {Smolik} and Ewelina {Kancik-Kołtun}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b20530",
    url = "https://www.peterlang.com/document/1331547"
}