1. L. Hörmander, The Analysis of Linear Partial Differential Operators, Vol. 3: Pseudodifferential Operators (Springer-Verlag, Heidelberg, 1983; Mir,Moscow, 1987).
2. H. Kumano-go, Pseudodifferential Operators (MIT Press, Cambridge, 1981).
3. E. M. Stein, Harmonic Analysis: Real-Variable Methods, Orthogonality and Oscillatory Integrals, in Princeton Math. Ser. (Princeton Univ. Press, Princeton, NJ, 1993), Vol. 43.
4. L. Hörmander, in Singular Integrals (Amer.Math. Soc., Providence, RI, 1967), pp. 138–183.
5. L. Hörmander, Comm. Pure Appl.Math. 24, 529 (1971).