How many co-authors does G. D. Nguyen have?
Count the number of co-authors that Gam D. Nguyen has.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/23/1577> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/23/1577>) }
<https://dblp.org/pid/23/1577>