@book { TheInfluenceofRatingChangesonBonds,
    title = "The Influence of Rating Changes on Bonds",
    author = "Alina Elena {Negrila}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638529648",
    url = "https://www.hausarbeiten.de/document/58888"
}