@Article{HR76,
  author = 	 { Laurent Hyafil and Ronald L. Rivest },
  title = 	 { Constructing optimal binary decision trees is {NP}-complete },
  journal = 	 { Information Processing Letters },
  OPTyear = 	 { 1976 },
  OPTmonth = 	 { May },
  date =         { 1976-05 },
  volume = 	 { 5 },
  number = 	 { 1 },
  pages = 	 { 15--17 },
  doi =          { 10.1016/0020-0190(76)90095-8 },
  url =          { http://www.sciencedirect.com/science/article/pii/0020019076900958 },
  OPTannote = 	 { (No abstract.) },
}