Question: Whose leaders are Willem-Alexander and Fredis Refunjol?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?uri onto:leader <http://dbpedia.org/resource/Willem-Alexander_of_the_Netherlands> . ?uri onto:leader <http://dbpedia.org/resource/Fredis_Refunjol> . }