著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) D.J. Williams,Ring current composition and sources: An update,Planetary and Space Science,0032-0633,Elsevier BV,1981-11,29,11,1195-1203,https://cir.nii.ac.jp/crid/1360574095877338752,https://doi.org/10.1016/0032-0633(81)90124-0