@article{aggarwal_sankar_calderbank_poor_2009, 
  title={Secrecy Capacity of a Class of Orthogonal Relay Eavesdropper Channels}, 
  volume={2009}, 
  DOI={10.1155/2009/494696}, 
  publisher={Springer Nature}, 
  author={Aggarwal and Sankar and Calderbank and Poor}, 
  year={2009}
  }