Didn't Pengfeng Li and Zheng Lu not co-author a paper?
Was a paper not not co-authored by Pengfeng Li and Lu, Z.?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/67/8714> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/15/2402> }
<https://dblp.org/pid/67/8714> <https://dblp.org/pid/15/2402>