By Ng L.H.   Fricke F.   in INTER-NOISE and NOISE-CON Congress and Conference Proceedings

ISSN:0736-2935|1991|5|297-300

Institute of Noise Control Engineering‎(1991)‎

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By He H.   Dai H.X.   Ng L.H.   Wong K.W.   Au C.T.   in Journal of Catalysis

ISSN:0021-9517|206|1|1-13

Academic Press‎(2002)‎

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