@InProceedings{BenGal93,
  author =       "Ben-Amram and Galil",
  title =        "When Can We Sort in o(n log n) Time? (Extended
                 Abstract)",
  booktitle =    "34th IEEE Symposium on Foundations of Computer
                 Science (FOCS)",
  year =         "1993",
  pages = 	 "538--546"
}