@book { DerEinsatzvonWingletsindermodernenLuftfahrt,
    title = "Der Einsatz von Winglets in der modernen Luftfahrt",
    author = "Alexander {Glöckle}",
    year = "2019",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/495103"
}