@techreport{PenmanEase,
  author	= {Mann, William C. and Hovy, Eduard H. and Paris, C{\'e}cile L. and Whitney, Richard A.},
  month		= sep,
  year		= {1988},
  title		= {PENMAN Natural Language Generation: A Case Study of Ease of Use},
  number	= {ISI/RR-88-217},
  institution	= {USC Information Sciences Institute}
}