What is the {human} for {doctoral student} of {Galileo Galilei}
Which was the individual as doctoral understudy of Galileo Galilei?
Which was the person as doctoral student of Galileo Galilei?
SELECT DISTINCT ?z WHERE { ?z rdf:type ontology:human . ?z property:doctoral_student resource:Galileo_Galilei }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P185> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q307> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?sbj where { ?sbj wdt:P185 wd:Q307 . ?sbj wdt:P31 wd:Q5 } 
Ostilio Ricci