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3. ASTM, 1971. ASTM E424-71 (2007): Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials. American Society for Testing and Materials, West Conshohocken, PA.
4. ASTM, 1987a. ASTM E891-87 (1992): Tables for Terrestrial Direct Normal Solar Spectral Irradiance for Air Mass 1.5. American Society for Testing and Materials, West Conshohocken, PA.
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