@incollection{TUW-120805, author = {Retscher, G{\"u}nther}, title = {Multi-sensor Systems for Pedestrian Navigation and Guidance Services}, booktitle = {Advances in Mobile Mapping Technology, ISPRS Book Series, Vol. 4}, year = {2007}, editor = {Tao, Vincent C. and Li, Jonathan}, pages = {89--94}, publisher = {Taylor {\&} Francis}, address = {London}, isbn = {978-0-415-42723-4}, note = {invited} }