Affiliation: | (1) Laser Laboratory, International Centre for Theoretical Physics, P.O. Box-586, 34100 Trieste, Italy (Fax: +39-40/22 40-443, E-mail: danailov@ictp.trieste.it), IT;(2) Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Bombay - 400 085, India, IN |