@inproceedings{sha90,
  author = {Adi Shamir},
  title = {{IP=PSPACE}},
  booktitle={FOCS '90},
  pages={11-15},
  year=1990
}

@article{ difhel76,
    author = {Whitfield Diffie and Martin E. Hellman},
    title = {New Directions in Cryptography},
    journal = {IEEE Transactions on Information Theory},
    volume = {IT-22},
    number = 6,
    pages = {644-654},
    year = 1976
}