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2. Grosskreutz, J.C., Private Communication.
3. Lichfield, J.W., et al., “A Method for Identifying Material Constraints to Implementation of Solar Energy Technologies”, PNL-2711, July 1978.
4. Treadwell, G.W., “Design Considerations for Parabolic-Cylindrical Solar Collectors”, SAND76–0082, July 1976.
5. Butler, B.L., Call, P.J., Jorgensen, G.L., and Pettit, R.B., “Solar Reflectance, Transmittance and Absorptance of Common Materials”, October 1979, Proceedings of the Solar Industrial Process Heat Conference, Oakland, California, November 1979.