Ioannis Chatzigiannakis Elisavet Konstantinou Vasiliki Liagkou Paul G. Spirakis Design, Analysis and Performance Evaluation of Group Key Establishment in Wireless Sensor Networks. 17-31 2007 171 Electr. Notes Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.entcs.2006.11.007 db/journals/entcs/entcs171.html#ChatzigiannakisKLS07