Avinash Srinivasan Feng Li Jie Wu Minglu Li Clique-based group key assignment in Wireless Sensor Networks. 226-239 2008 3 IJSN 4 http://dx.doi.org/10.1504/IJSN.2008.020730 db/journals/ijsn/ijsn3.html#SrinivasanLWL08