@misc{indiciae19d59250c4d3,
  title = {Evidence flow graph methods for validation and verification of expert systems},
  author = {Becker, Lee A. and Green, Peter G. and Bhatnagar, Jayant},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890018957},
  note = {Source identifier: 19890018957}
}