Le Tu Hai, and Nguyen Van Binh. “A STUDY ON THE INFLUENCE OF SOME FACTORS ON THE PRODUCTION OF SIO2 FROM RICE HUSK”. UED Journal of Social Sciences, Humanities and Education, Vol. 2, no. 3, Sept. 2012, pp. 8-15, https://jshe.ued.udn.vn/index.php/jshe/article/view/70.