Was a paper not not co-authored by Barra, Adriano and Alemanno, Francesco?
Didn't Adriano Barra and Alemanno, Francesco not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/49/8910> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/232/3905> }
<https://dblp.org/pid/49/8910> <https://dblp.org/pid/232/3905>