@book { DasApsismosaikvonSApollinareinClasse,
    title = "Das Apsismosaik von S. Apollinare in Classe",
    subtitle = "Seine Deutung im Kontext der Liturgie",
    author = "Angelika {Michael}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099351"
}