How many co-authors does Yan-Song Cui have?
Count the number of co-authors that Yan-Song Cui has.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/221/8670> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/221/8670>) }
<https://dblp.org/pid/221/8670>