@misc{indiciaef0a1782d4b9c,
  title = {Optimal spatial sampling techniques for ground truth data in microwave remote sensing of soil moisture},
  author = {Rao, R. G. S. and Ulaby, F. T.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780034338},
  note = {Source identifier: 19780034338}
}