48815document2233IEK_208E_-_NOISE_AND_SOUND_CONTROL_TECHNOLOGY_MARCH_05_-_BI.pdfapplication/pdf1960462013-07-13 00:45:43http://eprints.usm.my/1516/1/IEK_208E_-_NOISE_AND_SOUND_CONTROL_TECHNOLOGY_MARCH_05_-_BI.pdf