Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kagawa Yukio,"Institute of Sound and Vibration Research, University of Southampton, United Kingdom",THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN,03694232,Acoustical Society of Japan,1970,26,9,442-448,https://cir.nii.ac.jp/crid/1390001206565347456,https://doi.org/10.20697/jasj.26.9_442