Pongpitakkul, P., S. Sinthupinyo, and T. Charinpanitkul. “A new strategy to improve quality of ready mixed concrete using rice husk ash”. Engineering and Applied Science Research, vol. 43, Nov. 2016, pp. 144-6, https://ph01.tci-thaijo.org/index.php/easr/article/view/69718.