@book { DnischeZwillingsformelninTheorieundPraxis,
    title = "Dänische Zwillingsformeln in Theorie und Praxis",
    author = "Józef {Jarosz}",
    year = "2022",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19113",
    url = "https://www.peterlang.com/document/1165179"
}