@book { PhilologischeStudienzudenPapstbriefendesCodexepistolarisKarolinus,
    title = "Philologische Studien zu den Papstbriefen des «Codex epistolaris Karolinus»",
    author = "Tina {Orth-Müller}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0586-5",
    url = "https://www.peterlang.com/document/1053023"
}