@inproceedings{ GreenToddJ.KarvounarakisG.Tannen2007,
  author    = {Todd J. Green and Grigoris Karvounarakis and Val Tannen},
  title     = {Provenance Semirings},
  booktitle   = {PODS},
  pages   = {31--40} ,
  year   = {2007}
}

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