what is the company which has gerardo díaz ferrán and gerardo díaz ferrán as key person ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_keyPeople dbr_Gerardo_Díaz_Ferrán sep_dot var_uri dbp_keyPeople dbr_Gerardo_Díaz_Ferrán sep_dot var_uri a dbo_Company brack_close