1 Al Aburto, aburto@nosc.mil, 15 Mar 1997 2 Michael Ritzert, mjr@geo.uni-bonn.de, 26 Mar 1997 3 Peter Teichmann, sol@mail.wh1.tu-dresden.de, 02 May 1997 4 Manuel Jose Blanca Molinos, 101347.3363@compuserve.com, 13 May 1997