@INPROCEEDINGS{PenVen06,
  AUTHOR =       {P. Penna  and C. Ventre},
  TITLE =        {The Algorithmic Structure of Group Strategyproof Budget-Balanced Cost-Sharing Mechanisms},
  BOOKTITLE =    {23rd Annual Symposium on Theoretical Aspects of Computer Science (STACS)},
  YEAR =         {2006},
  volume =       {3884},
  series =       {LNCS},
  pages =        {337-348}
}