Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Eitarou Oka,Seasonal and interannual variation of North Pacific Subtropical Mode Water in 2003-2006,Journal of oceanography,09168370,Tokyo : Oceanographic Society of Japan,2009-04,65,2,151-164,https://cir.nii.ac.jp/crid/1523388079885349120,