By Qiu X.J.   Sha J.Z.   Yang J.   in Journal of Sound and Vibration

ISSN:0022-460X|182|1|167-170

Academic Press‎(1995)‎

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By Yang J.   Sha J.Z.   Qiu X.J.   in Journal of Sound and Vibration

ISSN:0022-460X|190|5|843-846

Academic Press‎(1996)‎

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By Feng S-S.   Qiu X-J.   Zhu Z-Y.   in International Journal of Theoretical Physics

ISSN:0020-7748|37|8|2105-2113

Springer Publishing Company ‎(1998)‎

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By Feng S-S.   Wang Z-X.   Qiu X-J.   in International Journal of Theoretical Physics

ISSN:0020-7748|38|5|1415-1422

Springer Publishing Company ‎(1999)‎

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