@article{kralevska2011performance,
  title={Performance of Amplify-and-Forward Relay Systems with On-off Relaying}
  author={Kralevska, Katina and Hadzi-Velkov, Zoran}
  journal={ICT Innovations 2011, Web Proceedings ISSN 1857-7288}
  pages={119--127}
  year={2011}
}