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- IEEE Pervasive Computing 10(3):4-7 (2011)
- IEEE Intelligent Systems 24(6):83-89 (2009)
- IEEE Pervasive Computing 10(2):16-18 (2011)
- Computer 44(9):51-58 (2011)
- Computer 44(9):73-79 (2011)
- Informatik-Spektrum 34(5):484--495 (October 2011)
- Informatik-Spektrum 34(5):469-483 (October 2011)
- Informatik-Spektrum 34(5):434-442 (October 2011)
- Informatik-Spektrum 34(5):462-468 (October 2011)
- Informatik-Spektrum 34(5):443-454 (October 2011)
- Computer 44(4):22-28 (2011)
- Computer 44(5):38-45 (2011)
- Computer 44(4):84-87 (2011)
- Computer 44(6):30-31 (2011)
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- Communications of the ACM (June 2011)
- Communications of the ACM (June 2011)
- Communications of the ACM (June 2011)


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