@book { LufthansaGroupEineFinanzanalysedesKonzerns,
    title = "Lufthansa Group. Eine Finanzanalyse des Konzerns",
    author = "Johann {Pannasch}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/437237"
}