Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Itoyama Naoyuki,Present State and Task of LNG Carriers,Marine Engineering,13461427,The Japan Institute of Marine Engineering,2007,42,5,874-878,https://cir.nii.ac.jp/crid/1390001204567968000,https://doi.org/10.5988/jime.42.5_874