วิวัฒน์ภิญโญ ศ.; ลีลาเกียรติสกุล ว. Improvement on the anti-VoIP spam mechanisms using Reverse Turing Test. JOURNAL OF INFORMATION SCIENCE AND TECHNOLOGY, [S. l.], v. 2, n. 2, p. 45–55, 2011. DOI: 10.14456/jist.2011.11. Disponível em: https://ph02.tci-thaijo.org/index.php/JIST/article/view/135187. Acesso em: 4 may. 2024.