Question: Who has authored books published by the Perkins school for the Blind?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:publisher <http://dbpedia.org/resource/Perkins_School_for_the_Blind> . ?x onto:author ?uri . ?x rdf:type onto:WrittenWork}