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) RANGARAJAN G. K.,Annual and daily variations in the occurrence of positive Dst index,Geophys. J. Roy. astr. Soc.,,,1981,66,,36-39,https://cir.nii.ac.jp/crid/1573105973971129216,