Count the different affiliations of the authors of 'A series of revisions of David Poole's specificity'.
How many different affiliations do the authors of 'A series of revisions of David Poole's specificity' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/amai/WirthS16> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/amai/WirthS16>