What is the {specialty} for {studied by} of {Nubia}
Which is the specialty that is studied by Nubia?
 select distinct ?obj where { wd:Q135028 wdt:P2579 ?obj . ?obj wdt:P31 wd:Q1047113 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q135028> . ?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> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1047113> } 
Which is the strength that's considered by Nubia?