@InProceedings{DFKRS99,
  author =       "Dinur, Irit and Fischer, Eldar and Kindler, Guy and 
                 Raz, Ran and Safra, Shmuel",
  title =        "{PCP} characterizations of {NP}: towards a
                 polynomially-small error-probability",
  booktitle =    "Proceedings of the 31st annual {ACM} Symposium
                 on Theory of Computing ({STOC})",
  pages =        "29--40",
  year =         "1999",
}