@techreport{UM-89,
  author	= {Bateman, John A. and Kasper, Robert T. and Moore, Johanna D. and Whitney, Richard A.},
  year		= {1990},
  title		= {A general organization of Knowledge for natural language processing: the PENMAN Upper Model},
  address	= {Marina del Rey, California},
  institution	= {USC/Information Sciences Institute}
}