Didn't Anis Rojbi and S. Rojbi not co-author a paper?
Was a paper not not co-authored by Anis Rojbi and Sami Rojbi?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/152/8945> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/218/3859> }
<https://dblp.org/pid/152/8945> <https://dblp.org/pid/218/3859>