1. On an inverse boundary value problem, Seminar on Numerical Analysis and its Applications to Continuum Physics, Soc. Brasileira de Matemática, Rio de Janeiro, 1980, pp. 65–73.
2. Determination of the diffusivity of an isotropic medium
3. Elliptic Problems in Nonsmooth Domains, Pitman, Boston, 1985.
4. Grundlehren d;Hörmander,1963
5. The inverse Sturm-Liouville problem. I