1. Sobolev Spaces;Adams,1975
2. G. Alessandrini, Stable determination of conductivity by boundary measurements, Appl. Anal., to appear.
3. Global uniqueness of a class of multidimensional inverse problems;Buhgeim;Soviet Math. Dokl.,1981
4. On an inverse boundary value problem;Calderon,1980
5. Introduction to the Theory of Linear Partial Differential Equation;Chazarain,1982