@misc{HarjuHeijenkLangendoerferetal., author = {Harju, J. and Heijenk, G. and Langend{\"o}rfer, Peter and Siris, V. A.}, title = {Wired / Wireless Internet Communications}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-540-68805-1}, pages = {XII, 223}, language = {en} } @misc{BrankiCrossDiazetal., author = {Branki, C. and Cross, B. and Diaz, G. and Langend{\"o}rfer, Peter and Laux, F. and Ortiz, G. and Randles, M. and Taleb-Bendiab, A. and Teuteberg, F. and Unland, R. and Wanner, G.}, title = {Techniques and Applications for Mobile Commerce}, publisher = {Amsterdam : IOS Press}, isbn = {978-1-58603-826-7}, language = {en} }