@book { berregionaleEnergieleitzentralefrdasHandwerk,
    title = "Überregionale Energieleitzentrale für das Handwerk",
    subtitle = "Machbarkeitsstudie",
    author = "Kai {Zitzmann}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832407582",
    url = "https://m.diplom.de/document/216666"
}