1. G. Beitmen, Mathematical Theory of Propagation of Electromagnetic Waves [in Russian], Fizmatgiz, Moscow (1958).
2. D. Bland, Theory of Linear Viscoelasticity, Pergamon, New York (1960).
3. G. N. Watson, Theory of Bessel Functions, Camb. U. P., New York.
4. E. W. Hobson, Theory of Spherical and Ellipsoidal Functions [Russian translation], IL, Moscow (1952).
5. L. D. Goldshtein and N. V. Zerov, Electromagnetic Fields and Waves [in Russian], Sovetskoe Radio, Moscow (1956).