Ngoc, Tran Hong. “HANGOUTPLUS: A PRIVACY PRESERVING SOCIAL NETWORKING SERVICE PROVIDING REAL-TIME AND MORE SECURE PROTOCOL BASED ON HANGOUT SYSTEM”. <i>Vietnam Journal of Science and Technology</i> 48, no. 4 (June 26, 2012). Accessed January 10, 2026. https://vjs.ac.vn/jst/article/view/1181.