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
"Ekeland, Ivar and Szulkin, Andrzej and NATO Advanced Study Institute on Variational Methods in Nonlinear Problems","Minimax results of Lusternik-Schnirelman type and applications : part 2 of the proceedings of the NATO ASI ""Variational Methods in Nonlinear Problems""",,Presses de l'Université de Montréal,1989,Séminaire de mathématiques supérieures,,2760602877,,https://cir.nii.ac.jp/crid/1130000794344828800