Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SAKAMOTO Shinichi and TAKAHASHI Risa,Directional sound source modeling for acoustic finite-difference time-domain analysis by using spherical harmonics,SEISAN KENKYU,0037105X,Institute of Industrial Science The University of Tokyo,2013,65,3,287-294,https://cir.nii.ac.jp/crid/1390001204060782592,https://doi.org/10.11188/seisankenkyu.65.287