Didn't Manuela G. Fern\u00E1ndez and Diego, David Mart\u00EDn de not co-author a paper?
Was a paper not not co-authored by Manuela Gamonal Fern\u00E1ndez and Diego, David Mart\u00EDn de?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/271/1360> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/78/1980> }
<https://dblp.org/pid/271/1360> <https://dblp.org/pid/78/1980>