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2. Solar thermal engine systems using two stage concentrators
3. U. Ortabasi, E.M. Gray and J. O'Gallagher. Paper presented at the Fifth Parabolic Dish Solar Thermal Power Program Review, Indian Wells, Ca., December, 1983.
4. R. Winston, J. O'Gallagher and U. Ortabasi. To appear in proceedings of the ASES meeting, Anaheim, Ca., June, 1984.
5. L.D. Jaffe. “Optimisation of dish solar collectors with and without secondary concentrators”. JPL Technical Report DOE/JPL-1060–57 (US Department of Energy, May, 1982).