Question: What are the hubs of PLUS Helicopter Services, a highway helicopter unit of PLUS Expressways?
SPARQL query: SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/PLUS_Expressways> <http://dbpedia.org/property/hubs> ?uri }
Answer: The hubs of PLUS Expressways are [Selangor, Sultan Abdul Aziz Shah Airport, Subang, Indonesia, Malaysia].