Didn't Ismail B. Sik Ali and Basile L. Agba not co-author a paper?
Was a paper not not co-authored by Ismail Ben Sik Ali and Basile L. Agba?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/210/9325> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/80/2641> }
<https://dblp.org/pid/210/9325> <https://dblp.org/pid/80/2641>