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) Koyo Yonebayashi and Tomoo Hattori,Improvements in the method for fractional determination of soil organic nitrogen,Soil Science and Plant Nutrition,0038-0768,Informa UK Limited,1980-12,26,4,469-481,https://cir.nii.ac.jp/crid/1360847870333094912,https://doi.org/10.1080/00380768.1980.10431235