Physics and technology of solar energy : proceedings of the International Workshop on Physics of Solar Energy, New Delhi, India, November 24-December 6, 1986 / ed. by H.P. Garg ... [et al.] ; ass. ed.: V.K. SharmaSolar water heating systems : proceedings of the Workshop on solar water heating systems, New Delhi, India 6-10 May, 1985 / ed. by H.P. Garg