Izumi, Tetsuya, Tetsuo Hattori, Hiroyuki Kitajima, and Toshinori Yamasaki. “Characters Recognition Method Based on Vector Field and Simple Linear Regression Model”. ECTI Transactions on Computer and Information Technology (ECTI-CIT) 1, no. 2 (March 15, 2016): 118–125. accessed January 7, 2026. https://ph01.tci-thaijo.org/index.php/ecticit/article/view/51840.