Count the number of co-authors that Abdalla, A. N. has.
How many co-authors does Ahmed N. Abdalla have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/131/1105> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/131/1105>) }
<https://dblp.org/pid/131/1105>