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Kothari,D. P.         Power system engineering / D. P. Kothari and I.J.Nagrath . – 2nd ed. . – New Delhi : McGraw Hill, 2013         1074p.         ISBN9780070647916 : RS. 610.00         1. Electric power systems         1. Electric power systems--Mathematical models         1. Large scale systems         I. Nagrath,I.J., Author