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
"D'Ancona, Piero and 木下, 保",On the wellposedness of the Cauchy problem for weakly hyperbolic equations of higher order,,"Institute of Mathematics, University of Tsukuba",2002,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130282270791990528