What is the {concept} for {studied by} of {materials science}
What topics does material science cover?
who concept for studied by of materials science?
SELECT DISTINCT ?z WHERE { ?z rdf:type ontology:concept . ?z property:studied_by resource:materials_science }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2579> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q228736> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q151885> } 
 select distinct ?sbj where { ?sbj wdt:P2579 wd:Q228736 . ?sbj wdt:P31 wd:Q151885 } 
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