Question: Which country's engineered have studied at Aero Klub in Wroclaw?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:institution res:AeroKlub_Wrocław . ?x prop:nationality ?uri  . }