621.31042 GUP 118669
Gupta, J. B. Theory and performance of electrical machines : D. C. machines, polyphase circuits and A. C. machines in S. I. units / by J. B. Gupta. - 7th rep ed. - Ludhiana : S.K. Kataria & sons , 2011 xvi, 759p.;25cm * Electrical machines Electrical Engineering
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