Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Asai Y.,Attending the International Hydrographic Conference,NAVIGATION,0450660X,Japan Institute of Navigation,1972,38,0,1-5,https://cir.nii.ac.jp/crid/1390001206052947456,https://doi.org/10.18949/jinnavib.38.0_1