จิตมนัส อ, อินทรภักดิ์ ว, คงนวล ณ. The Relation Between Number of Equilateral Triangle and Triangular Numbers and Number of Rectangle and Square Numbers. KKU Sci. J. [internet]. 2018 Jun. 29 [cited 2026 Sep. 19];46(2):383-92. available from: https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249891