Mention the co-authors of Rowena Cullen.
Who are the co-authors of Cullen, R.?
SELECT DISTINCT ?answer WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/63/263> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/63/263>) }
<https://dblp.org/pid/63/263>