1. Boundary problems for elliptic pseudo-differential operators;Eskin;Transl. of Math. Mon., American Math. Soc.,1981
2. Constructive proofs of representation theorems in separable Hilbert space;Hildebrandt;Comm. Pure Appl. Math.,1964
3. A finite element method for some integral equations of the first kind;Hsiao;J. Math. Anal. Appl.,1977
4. Hsiao , G. C. Wendland , W. L. On the boundary integral method for some exterior problems in elasticity. Akad. Dokl. Nauk SSR