1. C. Biscari andJ. Buon: LAI NI/40-81 (1981).
2. J. Buon: LAL/RT/80-04 (1980) and LAL/RT/80-08 (1980).
3. J. Buon: LAL/RT/82-06 (1982).
4. G. N. Watson:A treatise on the Theory of Bessel Functions, 2nd edition (Cambridge University Press, New York, N.Y., 1966).
5. V. N. Baier andYu. F. Orlov:Sov. Phys. Dokl.,10, 1145 (1966).