Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Leis, Rolf and Hildebrandt, Stefan",Partial differential equations and calculus of variations,,Springer-Verlag,1988,Lecture notes in mathematics,,"3540505083,0387505083",,https://cir.nii.ac.jp/crid/1130282268972284032