Tran, Phuong, Canh Nguyen, and Thang Ngo. “RECOVERY OF NI2+ BY DI-(2-ETHYLHEXYL) PHOSPHORIC ACID (HDEHP)”. Science and Technology Development Journal 12, no. 3 (February 15, 2009): 40-50. Accessed May 5, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/2218.