Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Nakagawa Seiji,Ultrasonic hearing by bone-conduction and its applications,Acoustical Science and Technology,1346-3969,ACOUSTICAL SOCIETY OF JAPAN,2020-11-01,41,6,851-856,https://cir.nii.ac.jp/crid/1391693801399666176,https://doi.org/10.1250/ast.41.851