@INPROCEEDINGS{witkowski:2011b,
  author =	 {Witkowski, Jens},
  title =	 {{Trust Mechanisms for Online Systems (Extended Abstract)}},
  booktitle =	 {Proceedings of the 22nd International Joint
                  Conference on Artificial Intelligence (IJCAI'11)},
  year =	 {2011},
pages = {2866--2867},
  month = 	 {July},
}