@unpublished{TUW-119392, author = {Retscher, G{\"u}nther}, title = {Mobile Navigationssysteme auf der Basis von Location Based Services (LBS)}, year = {2003}, note = {invited; talk: Universit{\"a}tslehrgang Verkehrstelematik-Management, Donau-Universit{\"a}t Krems, {\"O}sterreich; 2003-09-24} }