Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKASHIMA Kyoko,"Tokai University, School of Marine Science and Technology The Laboratory within Hearing of The Sea",NAVIGATION,09199985,Japan Institute of Navigation,2019,210,0,43-46,https://cir.nii.ac.jp/crid/1390283659826487808,https://doi.org/10.18949/jinnavi.210.0_43