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2. Frohne, H., “On the Main Parameters Which Determine the Noise-level of Asynchronous Machines,”(in German), PhD Thesis, Tech. Univ. of Hannover, W. Germany (1959).
3. Ellison, A. andYang, S., “Natural Frequencies of Stators of Small Electric Machines,”Proc. IEE,118 (1),185–190 (Jan. 1971).
4. Verma, S.P. andGirgis, R.S., “Resonance Frequencies of Electrical Machine Stators Having Encased Construction, Part I: Derivation of the General Frequency Equation,”IEEE Trans.,PAS-92 (5),1577–1585 (1973).
5. Verma, S.P. andGirgis, R.S., “Resonance Frequencies of Electrical Machine Stators Having Encased Construction, Part II: Numerical Results and Experimental Verification,”Ibid.,PAS-92,1586–1593 (1973).