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@unpublished{TUW-181324,
    author = {Gartner, Georg},
    title = {Location Based Services Research Directions},
    year = {2009},
    note = {invited; talk: 6th International Symposium on Location Based Services {\&} TeleCartography, Nottingham, UK; 2009-09-02 -- 2009-09-04}
}