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
"梶谷, 邦彦 and Wakabayashi, Seiichiro",The cauchy problem for a class of hyperbolic operators operators [sic] with double characteristics,,"Institute of Mathematics, University of Tsukuba",1994,Mathematical research note,,,,https://cir.nii.ac.jp/crid/1130574478766554133