Count the different affiliations of the authors of 'A normal form for spider diagrams of order'.
How many different affiliations do the authors of 'A normal form for spider diagrams of order' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/vlc/DelaneySTT14> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/vlc/DelaneySTT14>