@book { Anima,
    title = "Anima",
    subtitle = "Untersuchungen zur Frauenmystik des Mittelalters- Teil 1: Probleme der Mystikforschung - Mystikforschung als Problem",
    author = "Wolfgang {Beutin}",
    year = "1997",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1084884"
}