Count the number of co-authors that Michael K. Reiter has.
How many co-authors does Michael K. Reiter have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/r/MichaelKReiter> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/r/MichaelKReiter>) }
<https://dblp.org/pid/r/MichaelKReiter>