Do Van Thanh Tore E. Jønvik Do van Thuan Ivar Jørstad Enhancing Internet Service Security Using GSM SIM Authentication. 2006 conf/globecom/2006 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2006.235 db/conf/globecom/globecom2006net.html#ThanhJTJ06