Count the different affiliations of the authors of 'Building forensics in: supporting the investigation of digital criminal activities (invited talk)'.
How many different affiliations do the authors of 'Building forensics in: supporting the investigation of digital criminal activities (invited talk)' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/sigsoft/Williams17a> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/conf/sigsoft/Williams17a>