@misc{indiciae6919a409bc38,
  title = {Three CLIPS-based expert systems for solving engineering problems},
  author = {Parkinson, W. J. and Luger, G. F. and Bretz, R. E.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19960001797},
  note = {Source identifier: 19960001797}
}