Count the number of co-authors that Tuvi Etzion has.
How many co-authors does Tuvi E. have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/58/5154> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/58/5154>) }
<https://dblp.org/pid/58/5154>