Distributed Multiuser Sequential Channel Sensing Schemes in Multichannel   Cognitive Radio Networks
  This paper has been withdrawn by the author due to a crucial problem associated with Figs. 2 and 3. 
Hossein Shokri-Ghadikolaei, Fatemeh Sheikholeslami, Masoumeh   Nasiri-Kenari
cs.NI cs.PF math.PR