@techreport{TUW-139542, author = {Schwinger, Wieland and Gr{\"u}n, Ch. and Pr{\"o}ll, Birgit and Retschitzegger, Werner and Schauerhuber, Andrea}, title = {Context-awareness in Mobile Tourism Guides - A Comprehensive Survey}, institution = {E194 - Institut f{\"u}r Information Systems Engineering; Technische Universit{\"a}t Wien}, year = {2005}, url = {http://www.wit.at/people/schauerhuber/publications/contextAwareMobileTourismGuides_TechRep0507.pdf} }