@misc{indiciae8b2540c40be5,
  title = {The mathematical bases for qualitative reasoning},
  author = {Kalagnanam, Jayant and Simon, Herbert A. and Iwasaki, Yumi},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910053271},
  note = {Source identifier: 19910053271}
}