List the academic discipline of the journals whose publisher is SAGE Publications.
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/publisher> <http://dbpedia.org/resource/SAGE_Publications> . ?x <http://dbpedia.org/ontology/academicDiscipline> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AcademicJournal>}
SAGE_Publications