Nguyen Thi Thanh Tu, Vu Dinh Minh, Nguyen Thanh Tung, and Nguyen Minh Quy, “RESEARCHING AND BUILDING AN OPEN SOURCE ANTI-SPAM (SPAM-AVOIDANCE) FRAMEWORK FOR UNIVERSITY’S EMAIL SYSTEM”, jst, vol. 12, pp. 83-88, Jan. 2017.