S. V. Godambe (a), R. C. Rannot (a), K. S. Baliyan (b), A. K. Tickoo
  (a), S. Thoudam (a), V. K. Dhar (a), P. Chandra (a), K. K. Yadav (a), K.
  Venugopal (a), N. Bhatt (a), S. Bhattacharyya (a), K. Chanchalani (a),
  S.Ganesh (a), H. C. Goyal (a), U. C. Joshi (b), R. K. Kaul (a), M. Kothari
  (a), S. Kotwal (a), M.K. Koul (a), R. Koul (a), S. Sahaynathan (a), C. Shah
  (b), M. Sharma (a) ((a) Astrophysical Sciences Division, Bhabha Atomic
  Research Centre, Trombay, Mumbai, India (b) Physical Research Laboratory,
  Ahmedabad, India)