@book { ErneuerbareEnergien,
    title = "Erneuerbare Energien",
    author = "Pascal {Schmid}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656018308",
    url = "https://www.hausarbeiten.de/document/179486"
}