1. Alessandrini, G.: Singular solutions of elliptic equations and the determination of conductivity by boundary measurements. J. Differ. Eqn. 84, 252–272 (1990)
2. Alessandrini, G., Di Cristo, M.: Stable determanation of an inclusion by boundary measurements SIAM. J. Math. Anal. 37, 200–217 (2005)
3. Alessandrini, G., Di Cristo, M., Morassi, A., Rosset, E.: Stable determination of an inclusion in an elastic body by boundary measurements SIAM. J. Math. Anal. 46, 2692–2729 (2014)
4. Alessandrini, G., Sincich, E.: Cracks with impedance, stable determination from boundary data Indiana Univ. Math. J. 62(3), 947–989 (2013)
5. Calderon, A.: On an inverse boundary value problem. Seminar on Numerical Analysis and its Applications to Continuum Physics (Rio de Janeiro, 1980), pp. 65–73, Soc. Brasil. Mat., Rio de Janeiro (1980)