ชินปัญช์ธนะ น., and เพียซ้าย เ. “Fast Normalized Cross Correlation for Real Time Automatic Counting Objects System”. Progress in Applied Science and Technology, vol. 7, no. 2, Dec. 2017, pp. 168-82, https://ph02.tci-thaijo.org/index.php/past/article/view/243072.