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)
ITAGAKI Yoshio,Remark on the Essential Spectrum of Symmetrizable Operators,Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ ｔｈｅ Ｊａｐａｎ Ａｃａｄｅｍｙ,0021-4280,日本学士院,1971,47,SupplementII,1015-1018,https://cir.nii.ac.jp/crid/1390282680086895360,https://doi.org/10.2183/pjab1945.47.supplementii_1015