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
"Spagnolo, S and 木下, 保",Hyperbolic equations with non analytic coefficients well posed in all Gevrey classes for strictly hyperbolic equations,,"Institute of Mathematics, University of Tsukuba",2004,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130000793705525632