Was a paper not not co-authored by Gean Chia and Chen, W.?
Didn't Chia, Gean and Chen, W. not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/87/8892> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/16/1207> }
<https://dblp.org/pid/87/8892> <https://dblp.org/pid/16/1207>