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Raju, Naga J (1991) Comparative study of air heating solar collectors. In: International Journal of Energy Research, 15 (6). pp. 469-471.
Muralidhar, GK and Raju, Naga J and Mohan, S (1991) Differential Temperature Controller: An Energy Conservative Device for Solar Water Heating Systems. In: Energy Conversion and Management, 31 (1). pp. 61-63.