@book { DieProformaBerichterstattunginDeutschland,
    title = "Die Pro-forma-Berichterstattung in Deutschland",
    author = "Birthe {Großmann}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103495"
}