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) VAN Krevelen,Graphical-statistical method for the study of structure and reaction processes of coal.,Fuel,,,1950,29,,269-284,https://cir.nii.ac.jp/crid/1572543024333313792,