@book { TouristischePotentialeregenerativerEnergien,
    title = "Touristische Potentiale regenerativer Energien",
    author = "Sonja {Hohmann}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832468002",
    url = "https://m.diplom.de/document/222153"
}