- Computer 44(9):73-79 (2011)
- Communications of the ACM 54(1):132-138 (January 2011)
- Personal and Ubiquitous Computing 15(1):97-111 (January 2011)
- Multimedia Tools and Applications 51(1):77-98 (January 2011)
- Pragmatic Bookshelf, Raleigh, NC, (2007)
- MM '08: Proceedings of the 16th ACM International Conference on Multimedia, Vancouver, Canada, page 1071-1080. (2008)
- Computer 42(9):22-28 (2009)
- Wichmann, Heidelberg, (2008)
- Personal and Ubiquitous Computing 13(6):391-399 (2009)
- Personal and Ubiquitous Computing 13(4):265-280 (2009)
- Personal and Ubiquitous Computing 13(4):293-302 (2009)
- Springer, Berlin, 4. edition, (2005)
- Intelligent Event Processing, Papers from the 2009 AAAI Spring Symposium, page 1-5. (2009)
- Social Robotics 1(2):127-140 (2009)
- Informatik-Spektrum 31(5):435-450 (2008)
- Personal and Ubiquitous Computing 13(1):25-31 (2009)
- Personal and Ubiquitous Computing 13(4):303-320 (2009)
- Handbook of Ambient Intelligence and Smart Environments, (2010)
- IEEE Computer Graphics and Applications (2010)
- Personal and Ubiquitous Computing 13(4):255-264 (2009)


user