G. Barbiellini (1,2), A. Galli (2,3), L. Amati (4), A. Celotti (5), R.
  Landi (4), F. Longo (1,2), N. Omodei (6) and M. Tavani (3) ((1)University of
  Trieste, (2)INFN of Trieste, (3)IASF of Rome/INAF, (4)IASF of Bologna/INAF,
  (5)SISSA, (6)INFN of Pisa)