D. Wagner, T. Pintaric, F. Ledermann, and D. Schmalstieg. Pervasive Computing, volume 3468 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, 10.1007/11428572_13.(2005)
C. O’Driscoll, D. MacCormac, M. Deegan, F. Mtenzi, and B. O’Shea. Ubiquitous Intelligence and Computing, volume 5061 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, 10.1007/978-3-540-69293-5_39.(2008)