@misc{indiciae2ab500cc4c82,
  title = {Variability of crop calendar stage dates},
  author = {Sestak, M. L. and Hodges, T. and Artley, J. A.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800015235},
  note = {Source identifier: 19800015235}
}