@book { DevelopmentofAirfreightHubsintheGreaterPearlRiverDelta,
    title = "Development of Airfreight Hubs in the Greater Pearl River Delta",
    author = "Jana {Schebera}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832496579",
    url = "https://m.diplom.de/document/224734"
}