@misc{indiciaee6a7ea854064,
  title = {Penetration of sunlight into a canopy - Explicit models based on vertical and horizontal leaf projections},
  author = {Otterman, J. and Brakke, T.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870029025},
  note = {Source identifier: 19870029025}
}