@Inproceedings{ Liu13,
  author = {Y. Liu and M. Liu and J. Deng},
  Title = {Evaluating Opportunistic Multi-Channel MAC: Is Diversity Gain Worth
  the Pain?},
  Journal = {IEEE Journal on Selected Areas in Communications -
  Cognitive Radio Series}, 
  volume  = {31},
  number  = {11},
  pages   = {2301-2311},
  month = {November},
  Year = {2013}, 
  doi = {10.1109/JSAC.2013.131122} }