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) Syusaku Nishimura and Tomoki Hirota and Osamu Hirahara,Contribution of charred and buried plant fragments to humic and fulvic acids in Japanese volcanic ash soils,Soil science & plant nutrition,00380768,Tokyo : Japanese Society of Soil Science and Plant Nutrition,2006-12,52,6,686-690,https://cir.nii.ac.jp/crid/1520573330405478528,