@inproceedings{proano2013perfect,
   author = "Proa\~no, A. and Lazos, L.", 
   title = "Perfect Contextual Information Privacy in WSNs under Colluding Eavesdroppers", 
   booktitle = "6th ACM Conference on Security and Privacy in Wireless and Mobile Networks (WiSec'13) ",
   month = "April",
   year = "2013"
}