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
"Ishida, Haruhisa and Yagdjian, Karen",On a precise Levi condition in Gevrey classes for some infinitely degenerate hyperbolic equations and its necessity,,"Institute of Mathematics, University of Tsukuba",2000,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130000795639495424