@book { PolandinCentralandEasternEuropeinthe20thCenturyEconomicAspects,
    title = "Poland in Central and Eastern Europe in the 20th Century: Economic Aspects",
    author = "Przemysław {Waingertner}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b17725",
    url = "https://www.peterlang.com/document/1117824"
}