Didn't Katharina Quast and Andr\u00E9 Kaup not co-author a paper?
Was a paper not not co-authored by Katharina Quast and Andr\u00E9 Kaup?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/77/7731> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/00/6329> }
<https://dblp.org/pid/77/7731> <https://dblp.org/pid/00/6329>