@article{BirdHughes87:Alpha-Beta,
  title = "The Alpha-Beta Algorithm: {An} Exercise in Program Transformation",
  author = "Richard S. Bird and John Hughes",
  year = "1987",
  journal = "Information Processing Letters",
  month = "jan",
  number = "1",
  pages = "53--57",
  volume = "24",
  doi = "10.1016/0020-0190(87)90198-0",
}