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) Peter Jaehyun Cho,Sum of three squares and class numbers of imaginary quadratic fields,"Proceedings of the Japan Academy. Series. A, Mathematical sciences",03862194,Tokyo : Japan Academy,2011-06,87,6,91-94,https://cir.nii.ac.jp/crid/1521136281002123776,