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) CASTRO-JIMENEZ F. J.,Explicit calculations in rings of differential operators,Elements de la theorie des systemes differentiels geometriques,,Soc. Math. France,2004,,,,https://cir.nii.ac.jp/crid/1571417125343716352,