Rocha, Adrian V, Rose Appel, Syndonia M Bret-Harte, E. S Euskirchen, V. Salmon, and Gaius R Shaver. “Solar Position Confounds The Relationship Between Ecosystem Function And Vegetation Indices Derived From Solar And Photosynthetically Active Radiation Fluxes”. Agricultural And Forest Meteorology 298-299. Agricultural And Forest Meteorology (2021): 108291. doi:10.1016/j.agrformet.2020.108291.