@book { RationaleErwartungen,
    title = "Rationale Erwartungen",
    author = "Peter {Franken} and Nils Johann  {Schneider}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640160594",
    url = "https://www.hausarbeiten.de/document/111782"
}