Was a paper not not co-authored by Peter Jung and Andreas Waadt?
Didn't P. Jung and Andreas W. not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/63/6119-2> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/49/4369> }
<https://dblp.org/pid/63/6119-2> <https://dblp.org/pid/49/4369>