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@article{TUW-120314,
    author = {Retscher, G{\"u}nther and Kealy, Allison},
    title = {Ubiquitous Positioning Technologies for Modern Intelligent Navigation Systems},
    journal = {The Journal of Navigation},
    year = {2006},
    volume = {59},
    number = {1},
    pages = {91--103}
}