著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Hasegawa,Correlation between nitrogen isotopic ratios and productivity of calcareous nannoplankton of the Quaternary sediments off Bahama Bank of the Caribbean Sea,,,,2003,,,A137,https://cir.nii.ac.jp/crid/1370285707541090052,