Didn't Dimitris Agrafiotis and Pierre Ferr\u00E9 not co-author a paper?
Was a paper not not co-authored by Dimitris A. and Ferr\u00E9, Pierre?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/44/1875> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/98/515> }
<https://dblp.org/pid/44/1875> <https://dblp.org/pid/98/515>