C. C. Keong, K. Y. Mei, T. K. Lim, C. W. Kong, O. H. Siong, and D. K. Saundra Rajan, “Layered detection of tampered identity documents in electronic know-your-customer systems: A conceptual framework”, JISED, vol. 11, no. 83, pp. 990–1001, Jun. 2026.