ALAM, S. ., M. . COHEN, J. . VILLEGAS, and A. . AHMED. “NARROWCASTING FOR ARTICULATED PRIVACY AND ATTENTION IN SIP AUDIO CONFERENCING”. Journal of Mobile Multimedia, vol. 5, no. 1, Sept. 2008, pp. 012-28, https://journals.riverpublishers.com/index.php/JMM/article/view/4823.