Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Bernardi, Christine and Maday, Yvon",Approximations spectrales de problèmes aux limites elliptiques,,Springer-Verlag,1992,Mathématiques & applications,,"3540595767,2287003878",,https://cir.nii.ac.jp/crid/1130000794478317312