@book { DerMarktfrUmwelttechnikinderVRChina,
    title = "Der Markt für Umwelttechnik in der VR China",
    author = "Katja {Hellkötter}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832439125",
    url = "https://m.diplom.de/document/219553"
}