which silver medalist of the gymnastics at the 2004 summer olympics – men's rings was also the flagbearer of the bulgaria at the 2012 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Gymnastics_at_the_2004_Summer_Olympics_–_Men's_rings dbo_silverMedalist var_uri sep_dot dbr_Bulgaria_at_the_2012_Summer_Olympics dbp_flagbearer var_uri brack_close