Multikonferenz Wirtschaftsinformatik (MKWI) 2004. Bd 3. Mobile Business Systems - Mobile and Collaborative Business - Techniques and Applications for Mobile Commerce (TAMoCo) Branki, Cherif; Hampe, J Felix; Helfrich, Reiner; Kurbel, Karl; Schwabe, Gerhard; Teuteberg, Frank; Uellner, Stefan; Unland, Rainer and Wanner, Gerhard