1. ASTM G173-03, Standard Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37° Tilted Surface, ASTM International.
2. ASTM G177-03, Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface, ASTM International.
3. Plastics — Standard table for reference global solar spectral irradiance at sea level — Horizontal, relative air mass 1,2014
4. CIE 085-1989, Solar Spectral Irradiance, Commission Internationale de l´Eclairage.
5. C.A. Gueymard, SMARTS 2.9.5, Simple Model of the Atmospheric Radiative Transfer of Sunshine, https://www.nrel.gov/grid/solar-resource/smarts.html.