Irina Shklovski Janet Vertesi Emily Troshynski Paul Dourish The commodification of location: dynamics of power in location-based systems. 11-20 2009 UbiComp http://doi.acm.org/10.1145/1620545.1620548 conf/huc/2009 db/conf/huc/ubicomp2009.html#ShklovskiVTD09