@book { VerkehrindenAlpen,
    title = "Verkehr in den Alpen",
    author = "Sven {Svenson}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640086269",
    url = "https://www.hausarbeiten.de/document/110457"
}