@book { DeterminantenderKapitalstruktur,
    title = "Determinanten der Kapitalstruktur",
    author = "Mariya {Popova}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842810068",
    url = "https://m.diplom.de/document/228268"
}