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 "Beals, R. Michael (Robert Michael)",Propagation and interaction of singularities in nonlinear hyperbolic problems,,Birkhäuser,1989,Progress in nonlinear differential equations and their applications,,"0817634495,3764334495",,https://cir.nii.ac.jp/crid/1130282271074918528