@misc{indiciae3c9feaaf2e9f,
  title = {Stratum variance estimation for sample allocation in crop surveys},
  author = {Perry, C. R., Jr. and Chhikara, R. S.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19810004006},
  note = {Source identifier: 19810004006}
}