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@article{TUW-119833,
    author = {Retscher, G{\"u}nther and Thienelt, Michael},
    title = {NAVIO - A Navigation and Guidance Service for Pedestrians},
    journal = {Journal of Global Positioning Systems (Print Version)},
    year = {2004},
    volume = {3},
    number = {1 - 2},
    pages = {208--217},
    url = {http://www.gmat.unsw.edu.au/wang/jgps/v3n12/v3n12p26.pdf}
}