1. L. Brekhovskikh, Waves in Layered Media, Academic Press, New York, 1960.
2. W. Magnus and F. Oberhettinger, Formulas and Theorems for the Functions of Mathematical Physics, Chelsea Publishing Company, New York,1954.
3. I. S. Gradshteyn and I. M. Ryzhik, Table of Integrals, Series and Products, Academic Press, New York, 1965.
4. M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, Nat. Bur. St., Appl. Math. Series, 55, 1964.
5. P. M. Morse and H. Feshbach, Methods of Theoretical Physics, Vol. II, McGrawHill Book Company, Inc., New York, 1953.