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
"Koopmans, Tjalling Charles","Two papers on the representation of preference orderings : representation of preference orderings with independent components of consumption, and, Representation of preference orderings over time",,Cowles Foundation for Research in Economics at Yale University,1972,Cowles Foundation paper,,,,https://cir.nii.ac.jp/crid/1130282269446591360