Question: Which  institution of the Alton Ochsner is the alma mater of the Michael Hahn ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Alton_Ochsner> <http://dbpedia.org/ontology/institution> ?uri. <http://dbpedia.org/resource/Michael_Hahn> <http://dbpedia.org/ontology/almaMater> ?uri}