@book { DieSummaConfessorumdesJohannesvonErfurt,
    title = "Die Summa Confessorum des Johannes von Erfurt",
    subtitle = "Teil 1: Einleitung- Teil 2: Liber I- Teil 3: Liber II",
    author = "Norbert {Brieskorn}",
    year = "1982",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1072410"
}