@unpublished{TUW-120053, author = {Retscher, G{\"u}nther}, title = {Location Based Services (LBS) und pers{\"o}nliche Navigation}, year = {2005}, note = {talk: Vortragsreihe anl{\"a}sslich des Besuches der Fachhochschule Bochum, Institut f{\"u}r Geod{\"a}sie und Geophysik, TU Wien; 2005-05-09} }