@book { DasMarktpotentialregenerativerEnergien,
    title = "Das Marktpotential regenerativer Energien",
    author = "Cornelia {Blaschke}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836608848",
    url = "https://m.diplom.de/document/225534"
}