Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Takashima Kyoko,2009S-OS7-7 A Study about Optimal Route Planning for Coastal Ships Operation,Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers,2424-1628,The Japan Society of Naval Architects and Ocean Engineers,2009-05-28,8,0,147-150,https://cir.nii.ac.jp/crid/1390578371119288448,https://doi.org/10.14856/conf.8.0_147