edited by Donald Watson
McGraw-Hill , 1979
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Roytman, M. Ya
New Delhi: Amerind, 1975
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Asean -Ec Energy Management Training and Research Centre, 1997,
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O`Callaghan, Paul W.
Pergamon Press , 1978
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Frederick S. Merritt and Jonathan T. Ricketts, editor
McGraw-Hill, Inc, 1994
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