@book { PrognoseevaluationkonjunkturellerGesamtindikatorenfrDeutschland,
    title = "Prognoseevaluation konjunktureller Gesamtindikatoren für Deutschland",
    author = "Christian {Gayer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095987"
}