?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=L&rft.au=Wang%2C+L&rft.aulast=Wang&rft.title=IEEE+Communications+Magazine&rft.issn=0163-6804&rft.pages=49-55&rft.issue=6&rft.date=June+2018&rft.atitle=A+New+Look+at+Physical+Layer+Security%2C+Caching%2C+and+Wireless+Energy+Harvesting+for+Heterogeneous+Ultra-Dense+Networks&rft.volume=56&rft.genre=article