Beekhuyzen, J., L. von Hellens, M. Siedle, R. Topor, and S. Stevens. “Health Biometrics: Ready to Be a Smart Internet Technology?”. Malaysian Journal of Computer Science, vol. 17, no. 2, Dec. 2004, pp. 90-97, https://mojem.um.edu.my/index.php/MJCS/article/view/6221.