@incollection {springerlink:10.1007/11925941_5,
   author = {Mekouar, Loubna and Iraqi, Youssef and Boutaba, Raouf},
   affiliation = {University of Waterloo, Waterloo Canada Canada},
   title = {Handling Free Riders in Peer-to-Peer Systems},
   booktitle = {Agents and Peer-to-Peer Computing},
   series = {Lecture Notes in Computer Science},
   editor = {Despotovic, Zoran and Joseph, Sam and Sartori, Claudio},
   publisher = {Springer Berlin / Heidelberg},
   isbn = {},
   pages = {58-69},
   volume = {4118},
   url = {http://dx.doi.org/10.1007/11925941_5},
   note = {10.1007/11925941_5},
   year = {2006}
}