@inproceedings{TUW-120043, author = {Retscher, G{\"u}nther}, title = {A Knowledge-based Kalman Filter Approach for an Intelligent Pedestrian Navigation System}, booktitle = {ION GNSS 2005 Conference}, year = {2005}, organization = {Institute of Navigation}, publisher = {ION GNSS 2005 Conference}, address = {Long Beach, California, USA}, numpages = {11} }