@article{BartholdiToveyTrick:control92,
  author =       {Bartholdi {III}, John and Tovey, Craig and Trick, Michael},
  title =        {How Hard is it to Control an Election?},
  journal  =  {Social Choice and Welfare},
  year =         {1992},
  volume = {16},
  number = {8-9},
  pages = {27--40}
}