Kumeechai, P., Rattanakreep, P., Olarnkijanan, T. and Suchato, N. (2026) “An Automatic OMR System Using Digital Image Processing with Hybrid K-Means and K-Nearest Neighbor Classification”, NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY, 22(2), pp. 214–234. available at: https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/261327 (accessed: 15 September 2026).