@unpublished{TUW-119650, author = {Retscher, G{\"u}nther}, title = {Multisensorsysteme in der Navigation und f{\"u}r Location Based Services}, year = {2004}, note = {invited; talk: Geod{\"a}tisches Kolloquium an der Technischen Universit{\"a}t Berlin, Berlin, Germany; 2004-12-01} }