@book { DerEhestreitLotharsIImitKniginTheutberga,
    title = "Der Ehestreit Lothars II. mit Königin Theutberga",
    author = "Gergely {Kapolnasi}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638477017",
    url = "https://www.hausarbeiten.de/document/51837"
}