@book { UntersuchungenzudenPolitikadesAristoteles,
    title = "Untersuchungen zu den «Politika» des Aristoteles",
    author = "Markus {Frank}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086962"
}