@book { MinisterialittundRittertumimErec,
    title = "Ministerialität und Rittertum im Erec",
    author = "Yves {Dubitzky}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640744985",
    url = "https://www.hausarbeiten.de/document/161089"
}