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
"Shimoda, Taishi",Hypoellipticity of second order differential operators with sign-changing principal symbols,,Tohoku University,2000,Tohoku mathematical publications,,,,https://cir.nii.ac.jp/crid/1130282268854872960