@misc{indiciae35bfb490688e,
  title = {Testing validation tools on CLIPS-based expert systems},
  author = {Chang, C. L. and Stachowitz, R. A. and Combs, J. B.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920007385},
  note = {Source identifier: 19920007385}
}