@article{TUW-175526, author = {Fu, Qing and Retscher, G{\"u}nther}, title = {Another Look Indoors}, journal = {GPS World}, year = {2009}, volume = {20}, number = {3}, pages = {40--43}, url = {http://uc.gpsworld.com/gpsuc/Personal+Navigation/GPS---RFID/ArticleStandard/Article/detail/585103}, note = {invited} }