Didn't J. Li and Lei Yu not co-author a paper?
Was a paper not not co-authored by J. Li and Lei Yu?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/18/6870-1> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/01/2775-2> }
<https://dblp.org/pid/18/6870-1> <https://dblp.org/pid/01/2775-2>