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)
YOSHIKAWA Atsushi,Note on Singular Perturbation of Linear Operators,Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ｔｈｅ Ｊａｐａｎ Ａｃａｄｅｍｙ,0021-4280,日本学士院,1972,48,8,595-598,https://cir.nii.ac.jp/crid/1390282680089247488,https://doi.org/10.3792/pja/1195519569