44703document2019IEK_304E_-_NOISE_AND_SOUND_CONTROL_TECHNOLOGY_APRIL-MAY_06.pdfapplication/pdf1938252013-07-13 00:43:56http://eprints.usm.my/1308/1/IEK_304E_-_NOISE_AND_SOUND_CONTROL_TECHNOLOGY_APRIL-MAY_06.pdf