@book { MountainBikeUseonSharedTracks,
    title = "Mountain Bike Use on Shared Tracks",
    subtitle = "User Survey and Management Proposal for The Queen Charlotte Track in New Zealand",
    author = "Claudia {Kling}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832416607",
    url = "https://m.diplom.de/document/217537"
}