@book { AdFontes,
    title = "Ad Fontes",
    author = "Birgit {Feldner} and Verena {Halbwachs} and Thomas {Olechowski} and Josef {Pauser}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095031"
}