@misc{indiciaeea6dde8e6e94,
  title = {Growth stage estimation},
  author = {Whitehead, V. S. and Phinney, D. E. and Crea, W. E.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800007198},
  note = {Source identifier: 19800007198}
}