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) PETCH N. J.,The Cleavage Strength of Polycrystals,Journal of the Iron and Steel Institute,,,1953,174,,25-28,https://cir.nii.ac.jp/crid/1570291225556359040,