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Electricity
Parsons, D. J. F., (1926)
Nuttall, D., (1980)
(1965)
Energy demand : analysis, management and conservation
Bhatia, Ramesh K., (1990)
Energy in Asia
Siddayao, Corazón Morales, (1990)
Nonconventional energy
Jhirad, David, (1990)