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) GRINGEL W.,Electrical structure from 0 to 30 kilometers,The Earth's Electrical Environment,,NAP,1986,,,166-182,https://cir.nii.ac.jp/crid/1571135650886357888,