@book { EinfhrungindieInvestitionsrechnung,
    title = "Einführung in die Investitionsrechnung",
    subtitle = "Eine Fallstudiengeschichte",
    author = "Heinz Lothar {Grob}",
    year = "2015",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220974"
}