@book { DerhistorischeBuchbestandderUniversittssternwarteWien,
    title = "Der historische Buchbestand der Universitätssternwarte Wien",
    author = "Franz {Kerschbaum} and Thomas {Posch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099115"
}