@ARTICLE{CieEidPen05,
  AUTHOR =       {M. Cieliebak, S. Eidenbenz, and P. Penna},
  TITLE =        {Partial Digest is hard to solve for erroneous input data},
  JOURNAl =      {Theoretical Computer Science},
  YEAR =         {2005},
  volume =       {349},
  number =       {3},
  pages =        {361-381}
}