Van-Bach Le, Huu-Bang Tran, Vu To-Anh Phan. “Effects of Nano-Sio2 from Rice Husk Ash and Silica Fume on the Engineering Properties of Mortar and Concrete”. International Journal of Advanced Science and Technology, Vol. 29, no. 04, Oct. 2020, pp. 9846 -, http://sersc.org/journals/index.php/IJAST/article/view/33011.