@inproceedings{JJ99,
 author    = {Markus Jakobsson and Ari Juels},
 title     = {Proofs of Work and Bread Pudding Protocols},
 booktitle = {CMS '99: Proceedings of the IFIP TC6/TC11 Joint Working Conference on Secure Information Networks},
 year      = {1999},
 isbn      = {0-7923-8600-0},
 pages     = {258--272},
 publisher = {Kluwer, B.V.},
 address   = {Deventer, The Netherlands, The Netherlands},
 }