Count the different affiliations of the authors of 'Column Generation for the Minimum Hyperplanes Clustering Problem'.
How many different affiliations do the authors of 'Column Generation for the Minimum Hyperplanes Clustering Problem' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/colognetwente/AmaldiCD08> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/conf/colognetwente/AmaldiCD08>