@unpublished{TUW-119649, author = {Retscher, G{\"u}nther}, title = {The NAVIO Project at the Vienna University of Technology, Austria - A Pedestrian Navigation System for Combined Indoor and Outdoor Environments}, year = {2004}, note = {invited; talk: Seminar of the Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University, Columbus, Ohio, USA; 2004-09-29} }