Which author published the paper on Density signatures and has the name Popovic?
Name the author who published the paper on Density signatures and has the name Popovic.
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/globecom/BeekP09> <https://dblp.org/rdf/schema#authoredBy> ?answer }
<https://dblp.org/rec/conf/globecom/BeekP09>