@book { DiehelfeThematikinHartmannvonAuesIwein,
    title = "Die helfe-Thematik in Hartmann von Aues Iwein",
    author = "Alexander {Pieper}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656571193",
    url = "https://www.hausarbeiten.de/document/266777"
}