著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Richards,Progress report from the Task Group to establish a GSSP close to the existing Visean–Serpukhovian boundary,Newsletter on Carboniferous Stratigraphy,,,2003,21,,6,https://cir.nii.ac.jp/crid/1370846644749557544,