@book { GentechnischeProduktionvonInsulin,
    title = "Gentechnische Produktion von Insulin",
    author = "Melanie {Mai}",
    year = "2001",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638983679",
    url = "https://www.hausarbeiten.de/document/99934"
}