J. Siwei, C. Zhihua, Z. Dan, L. Yadong, and L. Qu. Proceedings International Conference on Wireless
Communications, Networking and Mobile Computing, 2, page 1264--1267. IEEE, (23-26 September 2005)
C. Gagné, M. Schoenauer, M. Parizeau, and M. Tomassini. ARTCOLLOQUE, inria-00000996. l�Equipe TAO INRIA Futurs, LRI Bat. 490, Universit�e Paris Sud, 91405 Orsay
CEDEX, France, (January 2006)