@misc{indiciaed25621823f09,
  title = {Calculation of solar radiation in mountainous terrain},
  author = {Alan L. Flint and S.W. Childs},
  year = {1987},
  doi = {10.1016/0168-1923(87)90061-x},
  url = {https://pubs.usgs.gov/publication/70199577},
  note = {Source identifier: 70199577}
}