@misc{indiciae248f5dd569ff,
  title = {Econometric models for predicting confusion crop ratios},
  author = {Umberger, D. E. and Proctor, M. H. and Clark, J. E. and Eisgruber, L. M. and Braschler, C. B.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800007190},
  note = {Source identifier: 19800007190}
}