著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "Davis, Harold T. (Harold Thayer) and Cowles Commission for Research in Economics",The theory of linear operators from the standpoint of differential equations of infinite order,,University Microfilms,1936,O-P book,,,,https://cir.nii.ac.jp/crid/1130000795330828288