Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) IIDA K.,Measurement of Fish School Volume by Multi-beam Sonar -Directional Resolution and Estimation Error-,Oceans04 MTS/IEEE Techno-Ocean04,,,2004,,,401-408,https://cir.nii.ac.jp/crid/1573950399737443200,