@book { ZurTheoriedesWissens,
    title = "Zur Theorie des Wissens",
    subtitle = "Ein Neuansatz nach S.L. Frank (1877-1950)",
    author = "Rudolf L. W. {Tannert}",
    year = "1975",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069482"
}