@article{joshi_nam_kim_2013, 
  title={Cognitive Radio Wireless Sensor Networks:  Applications, Challenges and Research Trends}, 
  volume={13}, 
  DOI={10.3390/s130911196}, 
  publisher={MDPI AG}, 
  author={Joshi and Nam and Kim}, 
  year={2013}, 
  month={Aug}
  }