@book { ELearninginderrztefortbildung,
    title = "E-Learning in der Ärztefortbildung",
    author = "Axel {Gerstenberger}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638071840",
    url = "https://www.hausarbeiten.de/document/94197"
}