How many authors of 'A Coordinate Geometry Learning Environment with Game-Like Properties' have Carnegie Mellon University, Pittsburgh, USA as their primary affiliation?
What is the count of authors of 'A Coordinate Geometry Learning Environment with Game-Like Properties' who have Carnegie Mellon University as their primary affiliation?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/its/RaiBH10b> <https://dblp.org/rdf/schema#authoredBy> ?answer . ?answer <https://dblp.org/rdf/schema#primaryAffiliation> 'Carnegie Mellon University, Pittsburgh, USA' }
<https://dblp.org/rec/conf/its/RaiBH10b>