@book { DieGegenwartChristiinderKirchebeiLeodemGroen,
    title = "Die Gegenwart Christi in der Kirche bei Leo dem Großen",
    author = "Hans {Feichtinger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103146"
}