Question: Which river's source mountain is Baikal Mountains and is located in Laptev Sea ?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:sourceMountain <http://dbpedia.org/resource/Baikal_Mountains> . ?uri prop:mouthLocation <http://dbpedia.org/resource/Laptev_Sea>  . ?uri rdf:type onto:River}