Wiangsamut, S., Eua-Anant, N. and Phornphatcharaphong, W. (2021) “Fast boundary extraction of color image using negative divergence of a normal compressive vector field”, Engineering and Applied Science Research, 49(2), pp. 168–180. available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/245621 (accessed: 17 September 2026).