1. L. Hörmander, Analysis of Partial Differential Operators (Springer, Berlin, 1983), Vols. I–IV.
2. M. Taylor, Pseudodifferential Operators (Princeton Univ. Press, Princeton, 1981).
3. F. Treves, Introduction to Pseudodifferential Operators and Fourier Integral Operators (Springer, New York, 1980).
4. S. Rempel and B.-W. Schulze, Index Theory of Elliptic Boundary Problems (Akademie, Berlin, 1982).
5. B.-W. Schulze, Boundary Value Problems and Singular Pseudo-Differential Operators (Wiley, Chichester, 1998).