Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) USAGAWA T.,Active Noise Control System Using Motional Feedback Loudspeaker,"Proc. Int. Symp. Active Control of Sound Vib., 1991",,,1991,,,,https://cir.nii.ac.jp/crid/1570572700233714432,