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 "Witt, Ingo",Non-linear hyperbolic equations in domains with conical points : existence and regularity of solutions,1st ed,"Akademie Verlag,VCH",1995,Mathematical research = Mathematische Forschung,,3055016912,,https://cir.nii.ac.jp/crid/1130000794325721984