@book { CollateralizedDebtObligations,
    title = "Collateralized Debt Obligations",
    subtitle = "First Loss Piece Retention, Combination Notes, and Tranching",
    author = "Albert {Schaber}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106880"
}