Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Agranovich, M. S. and Egorov, I︠U︡. V. (I︠U︡riĭ Vladimirovich) and Shubin, M. A. (Mikhail Aleksandrovich)",Elliptic boundary value problems,,Springer-Verlag,1997,Encyclopaedia of mathematical sciences,,"3540570446,0387570446",,https://cir.nii.ac.jp/crid/1130000796773975936