Was a paper not not co-authored by Kacic, Z. and Matej Rojc?
Didn't Zdravko Kacic and Matej Rojc not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/19/2375> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/61/5212> }
<https://dblp.org/pid/19/2375> <https://dblp.org/pid/61/5212>