1. ASTM G159-98, Annual Book of ASTM Standards , Vol. 14.04, American Society for Testing and Materials, West Conshohocken, Pa. 2000
2. Ultraviolet Spectral Energy Distributions of Natural Sunlight and Accelerated Test Light Sources*
3. ASTM D1435-99, Annual Book of ASTM Standards , Vol. 8.01, American Society for Testing and Materials, West Conshohocken, Pa. 2000