1. S. Bochner, W.T. Martin, Several Complex Variables (Princeton University Press, Princeton, 1948)
2. G. Eskin, Boundary Value Problems for Elliptic Pseudodifferential Equations (American Mathematical Society, Providence, RI, 1981)
3. F.D. Gakhov, Boundary Value Problems (Dover, New York, 1981)
4. N.I. Muskhelishvili, Singular Integral Equations (North Holland, Amsterdam, 1976)
5. V.B. Vasilyev, Wave Factorization of Elliptic Symbols: Theory and Applications (Kluwer Academic Publishers, Boston, 2000)