Nguyen, Minh, Oanh Pham, Ha Huynh, and Vien Le. “Synthesis of Nano Co1-XNixFe2O4 by Sol-Gel Method and Its Properties”. Science and Technology Development Journal 19, no. 3 (September 30, 2016): 123-128. Accessed July 23, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/585.