@article{Silberschatz91,
  author = {Silberschatz, A. and Stonebraker, M. and Ullman, J. D.},
  interhash = {94b1d6c759f43c2d4bebfecbbf881b43},
  intrahash = {1bf2eba5e8e15e9d27355f0472bea9f9},
  journal = {Communications of the ACM},
  month = {October},
  number = 10,
  pages = {110--120},
  publisher = {ACM Press},
  title = {Database systems : Achievements and opportunities},
  volume = 34,
  year = 1991
}