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
"Colombini, Ferruccio and Ishida, Haruhisa and Orrú, Nicola",On the Cauchy problem for finitely degenerate hyperbolic equations of second order,,"Institute of Mathematics, University of Tsukuba",1999,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130000797404871552