@book { DieverligenProblematikinHartmannsvonAueErec,
    title = "Dieverligen Problematik in Hartmanns von Aue Erec",
    author = "Kristina {Müller}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638474399",
    url = "https://www.hausarbeiten.de/document/51481"
}