Reference:

1. A.E. Fitzgerald, C. Kingsly, Jr., and S.D. Umans, Electrical Machines, 5th edition, McGraw-Hill New York, 1990..

2. M.G. Say, The Performance and Design of Alternating current Machines, third edition, CBS Publishers and Distributors, New Delhi.

3. D.P. Kothari, I.J. Nagrath, Electrical Machines, Tata McGraw-Hill, 2004.