1. ASTM E 892-92. Standard Tables for Terrestrial Solar Spectral Irradiance at Air Mass 1?5 for a 37° Tilted Surface. American Society for Testing and Materials: West Conshohocken, PA, 1992.
2. Round Robin test on translation procedures for measured PV generator characteristics. Proceedings of the 14th European Photovoltaic Solar Energy Conference, Barcelona, 30 June-4 July 1997; 203-206.
3. Validation of a Photovoltaic Module Energy Ratings Procedure at NREL, NREL/TP-520-26909. National Renewable Energy Laboratory: Golden, CO, 1999.
4. ASTM E 1036-96. Standard Test Methods for Electrical Performance of Nonconcentrator Terrestrial Photovoltaic Modules and Arrays Using Reference Cells. American Society for Testing and Materials: West Conshohocken, PA, 1996.
5. ASTM E 1021-95. Standard Test Methods for Measuring the Spectral Response of Photovoltaic Cells. American Society for Testing and Materials: West Conshohocken, PA, 1995.