Institution: | (1) Department of Physics, Madras Christian College, 600 059 Tambaram, Madras, India;(2) Present address: Department of Theoretical Physics, University of Madras, 600 025 Madras, India;(3) Harvard Smithsonian Centre for Astrophysics, 02138 Cambridge, MA, USA;(4) Department of Theoretical Physics, University of Madras, Guindy Campus, 600 025 Madras, India |