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3. ASTM-E927, 2005. Americal Society for Testing and Materials Standard Specification for Solar Simulation for Terrestrial Photovoltaic Testing.
4. ASTM-G173, 2006. American society for testing and materials standard for reference solar spectral irradiance: direct normal and hemispherical on 37o tilted surfaces.
5. Systematic error in the measurement of very high solar irradiance;Ballestrı́n;Sol. Energy Mater. Sol. Cells,2003