ตาใจ ธ, ณ ตะกั่วทุ่ง อ, หัตถสิน ย. Development of the Pinpoint Material on Barcode Symbols with a Barcode Readable System for Northern School for the Blind under the Patronage of the Queen, Chiang Mai. RMUTL.Eng.J. [internet]. 2016 Dec. 1 [cited 2026 Aug. 29];1(2):14-21. available from: https://ph01.tci-thaijo.org/index.php/RMUTLEngJ/article/view/183879