@String{aaai90 = "Proc. National Conference on Artificial Intelligence,
                 Boston"}
@InProceedings{Carberry90,
  author =       "Sandra Carberry",
  title =        "Incorporating default inferences into plan
                 recognition",
  booktitle =    "aaai90",
  year =         "1990",
  pages =        "471--478",
  address =      "Boston, MA",
}