Question: Which cities have the river one of whose Tributary is the Missouri's big spring?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/rightTributary> <http://dbpedia.org/resource/Big_Spring_(Missouri)> . ?x <http://dbpedia.org/ontology/city> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Answer: The cities of the river whose right tributary is the big spring in Missouri are [Missouri, Doniphan, Missouri, Van Buren, Missouri].