Off-line Karma: Towards a Decentralized Currency for Peer-to-peer and Grid Applications (Extended Abstract). Garcia, F. D. & Hoepman, J. In Workshop on Secure Multiparty Computations (SMP), Amsterdam, The Netherlands, Oct 7–8, 2004.
bibtex   
@InProceedings{garcia2004karmaabstract,
  author =   "Flavio D. Garcia and Jaap-Henk Hoepman",
  title =    "Off-line Karma: Towards a Decentralized Currency for
                  Peer-to-peer and Grid Applications (Extended Abstract)",
  booktitle =    "Workshop on Secure Multiparty Computations (SMP)",
  address =      "Amsterdam, The Netherlands",
  month =        "Oct 7--8",
  year =     "2004"
}
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