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by Sivarajan, V.V; .
by Liebesny, F.
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by Sofowara, A.
by Chittenden, A.E.
by -- United Nations Development Programme
by -- Division of Technological Research and Higher Education, Energy Information Section, UNESCO, Paris
by -- United Nation, Economic and Social Commission for Asia and the Pacific
by Pirie, N.W.
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by Svehia, G.
by Tipnis,H.P.