@inproceedings{hofheinz06possibility,
  author       = {Hofheinz, Dennis and M\"{u}ller-Quade, J\"{o}rn and Unruh, Dominique},
  title        = {On the (Im-)Possibility of Extending Coin Toss},
  booktitle    = {Advances in Cryptology, Proceedings of EUROCRYPT '06},
  series       = {Lecture Notes in Computer Science},
  volume       = {4004},
  year         = {2006},
  publisher    = {Springer},
  pages        = {504-521},
  note         = {Preprint on IACR ePrint 2006/177}
}