Count the different affiliations of the authors of 'Quality assurance and quality development: what will make a difference?'.
How many different affiliations do the authors of 'Quality assurance and quality development: what will make a difference?' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/ifip3-6/Calvert03> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/conf/ifip3-6/Calvert03>