Which author published the paper on Subgraph density and has the name Sidiropoulos?
Which author named Nicholas published the paper on Subgraph density?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/wsdm/KonarS21> <https://dblp.org/rdf/schema#authoredBy> ?answer }
<https://dblp.org/rec/conf/wsdm/KonarS21>