Didn't Edith Elkind and Katar\u00EDna Cechl\u00E1rov\u00E1 not co-author a paper?
Was a paper not not co-authored by Elkind, Edith and Katar\u00EDna C.?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/31/2621> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/97/6654> }
<https://dblp.org/pid/31/2621> <https://dblp.org/pid/97/6654>