By Yin J.P.   Ahmed S.R.   Dobrzynski W.   in Journal of Sound and Vibration

ISSN:0022-460X|225|1|171-187

Academic Press‎(1999)‎

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By Yin J. P.   Ahmed S. R.   in Journal of the American Helicopter Society

ISSN:2161-6027|45|4|293-302

AHS International‎(2000)‎

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