@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  = {},
  number  = {},
  pages   = {},
  month = {November},
  Year = {2013},
  Note = {to appear} }