School of Physics,

University of Hyderabad,

Hyderabad-500046

A.P, INDIA

Mobile : + 9849976697

+91 40 23134325 (Off), 91 40 23134300 (Off), 91 40 23012455 (Off)

Fax : +91 40 23010227

E-mail : bbambah@gmail.com, bbambah@rediffmail.com