Was a paper not not co-authored by Peter M. A. Sloot and Tirado-Ramos, A.?
Didn't Peter M. A. Sloot and Tirado-Ramos, A. not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/81/5292> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/55/2731> }
<https://dblp.org/pid/81/5292> <https://dblp.org/pid/55/2731>