List sports managers who managed Middlesbrough F.C. and England national under-21 football team?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/managerClub> <http://dbpedia.org/resource/Middlesbrough_F.C.> . ?uri <http://dbpedia.org/property/managerclubs> <http://dbpedia.org/resource/England_national_under-21_football_team>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/SportsManager>}
Middlesbrough_F.C. England_national_under-21_football_team