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
"Hua, Lo-keng and Lin, Wei and Wu, Ci-Quian",Second-order systems of partial differential equations in the plane,,Pitman,1985,Research notes in mathematics,,0273086456,,https://cir.nii.ac.jp/crid/1130282272006105216