@misc{indiciaeb43c5ea720c0,
  title = {Validation and verification of expert systems using evidence flow graphs},
  author = {Becker, Lee A. and Green, Peter E. and Duckworth, R. James and Bhatnagar, Jayant},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900023441},
  note = {Source identifier: 19900023441}
}