@article{du_jiang_zhang_wang_ren_debbah_2018, 
  title={Secure Satellite-Terrestrial Transmission Over Incumbent Terrestrial Networks via Cooperative Beamforming}, 
  DOI={10.1109/jsac.2018.2824623}, 
  publisher={Institute of Electrical and Electronics Engineers (IEEE)}, 
  author={Du and Jiang and Zhang and Wang and Ren and Debbah}, 
  year={2018}
  }