which scientist is known for the nordström's theory of gravitation and the reissner–nordström metric ?
select distinct var_uri where brack_open var_uri dbo_knownFor dbr_Nordström's_theory_of_gravitation sep_dot var_uri rdf_type dbo_Scientist sep_dot var_uri dbo_knownFor dbr_Reissner–Nordström_metric sep_dot brack_close