@article{TUW-167837, author = {Retscher, G{\"u}nther and Fu, Qing}, title = {Active RFID Trilateration for Indoor Positioning}, journal = {Coordinates}, year = {2008}, volume = {IV}, number = {5}, pages = {10--15}, url = {http://mycoordinates.org/may08/trilateration.php} }