1. A. A. Logunov, M. A. Mestvirishvili, G. L. Rcheulishvili, and A. P. Samokhin. Preprint IFVÉ OTF 76-20, Serpukhov (1976).
2. M. Froissart, Proceedings of La Jolla Conference (1961);
3. V. N. Gribov, Zh. Eksp. Teor. Fiz.,41, 1962 (1962).
4. E. W. Hobson, Theory of Spherical and Ellipsoidal Functions, Cambridge (1931).
5. R. Boas, Entire Functions, New York (1954).