16Th Sigrav Conference on General Relativity and Gravitational Physics, Sigrav04, Date: 13 September 2004 through 16 September 2004, Location: Vietri sul Mare, Sponsors: Salerno University;Naples University;Ital. Soc. Gen. Relativ. Gravitational Phys. (SIGRAV);Instituto Nazionale di Fisica Nucleare (INFN);Regione Campania