1. The Measurement of Appearance, John Wiley, New York (1975).
2. ASTM Research Report 1144, Interim Report No. 2, Recommended Color Hold Guidelines/Ten Year Weathering Study of Vinyl Siding (D-3679).
3. ASTM, 1991, Volume 8.04, Plastic Pipe and Building Products, D-20 Proposal P223.
4. Vinyl Siding Institute, Interim Report No. 1, Analysis of Two Year Weathering Data, VS2W—Ten Year Weathering Study, 1992.
5. The chemical mechanisms of outdoor weathering in polyvinyl chloride