@misc{indiciae1331b1516c0f,
  title = {Sky type discrimination using a ground-based sun photometer},
  author = {Thomas P. DeFelice and Bruce K. Wylie},
  year = {2001},
  doi = {10.1016/s0169-8095(01)00122-3},
  url = {https://pubs.usgs.gov/publication/70155995},
  note = {Source identifier: 70155995}
}