Didn't Gibbons, Peter B. and J. W. Giffin not co-author a paper?
Was a paper not not co-authored by Peter B. Gibbons and J. W. Giffin?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/46/1177> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/98/6143> }
<https://dblp.org/pid/46/1177> <https://dblp.org/pid/98/6143>