By Beltman W.M.   Shepherd J.E.   in Journal of Sound and Vibration

ISSN:0022-460X|252|4|617-655

Academic Press‎(2002)‎

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By Brill T. B.   Brush P. J.   James K. J.   Shepherd J. E.   Pfeiffer K. J.   in Applied Spectroscopy

ISSN:0003-7028|46|6|900-911

Society for Applied Spectroscopy‎(1992)‎

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