1. L. Hörmander, The Analysis of of Linear Partial Differential Operators,Vol. 1–4, Springer-Verlag, New York, 1983–1985.
2. A. G. Ramm, Multidemensional Inverse Scattering Problems, Longman, New York, 1992.(Expanded Russian edition will be published by Mir Publishers, Moscow, in 1993 ).
3. A. G. Ramm, Random Fields Estimation Theory, Longman, New York, 1990.
4. A. G. Ramm, Scattering by Obstacles, D. Reidel, Dordrecht, 1986.
5. A. G. Ramm, Recovery of the potential from fixed-energy scattering data, Inverse Problems
4 (1988), 877–886; 5 (1989), 255.