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@unpublished{TUW-119450,
    author = {Retscher, G{\"u}nther},
    title = {Konzepte mobiler Navigationssysteme auf der Basis von LBS (Location Based Services)},
    year = {2002},
    note = {talk: GeoPo 2002 Workshop on Location-Based Services and Mobile Navigation, Podersdorf; 2002-06-25 -- 2002-06-26}
}