@article{clanceyaij,
  author	= {Clancey, William},
  year		= {1983},
  title		= {The Epistemology of a Rule-Based Expert System: A Framework for Explanation},
  journal	= {Artificial Intelligence},
  volume	= {20},
  number	= {3},
  pages		= {215--251},
  note		= {Also in \em Rule-Based Expert Systems: The MYCIN Experiments of the Stanford Heuristic Heuristic Programming Project; Buchanan and Shortliffe (eds), Addison-Wesley, 1984}
}