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 "小池, 健一",A lower bound for the Bayes risk in the sequential case,,"Institute of Mathematics, University of Tsukuba",1997,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130000795920883072