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3. SRI International. A Comparative Evaluation of Solar Alternatives: Implications for Federal R & D, Vols. I and II. January 1978.
4. C. L. Wilson (ed). “Energy: Global Prospects 1985–2000”. McGraw-Hill, New York (1977).
5. D. E. Carr. “Energy and the Earth Machine”. W. W. Norton, New York (1977).