1. S. Axler, P. Bourdon, and W. Ramey, Harmonic Function Theory (Springer, New York, 2001).
2. L. Ahlfors, Complex Analysis (McGraw-Hill, New York, 1979).
3. R. Bracewell, The Fourier Transform and Its Applications, 3rd ed. (McGraw-Hill, New York, 2000).
4. R. Carroll, Transmutation Theory and Applications (North Holland, Amsterdam, 1986).
5. R. Carroll, Transmutation, Scattering Theory and Special Functions (North Holland, Amsterdam, 1982).