Name the author who published the paper on Spectrum sharing and has the name Umadevi.
Which author named K. published the paper on Spectrum sharing?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/wpc/VijayU21> <https://dblp.org/rdf/schema#authoredBy> ?answer }
<https://dblp.org/rec/journals/wpc/VijayU21>