@inproceedings{LRS07b,
   author = {Stefan Liske and Klaus Rebensburg and Bettina Schnor},
   title = {Implicit Reputation in a Payment Integrated SIP Network},
   booktitle = {Proceedings of the 14th Annual Workshop of HP Software  
University Association (HP-SUA)},
   pages ={161--170},
   month = {July},
   year = {2007},
   address = {Munich, Germany},
}