Count the number of co-authors that Ragab, M. has.
How many co-authors does Mohamed Ragab have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/205/4727> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/205/4727>) }
<https://dblp.org/pid/205/4727>