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
"木下, 保",On the 2 by 2 weakly hyperbolic systems,,"Institute of Mathematics, University of Tsukuba",2007,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130282268862642944