Nguyen, Minh, Oanh Pham, Ha Huynh, and Vien Le. 2016. “Synthesis of Nano Co1-XNixFe2O4 by Sol-Gel Method and Its Properties”. Science and Technology Development Journal 19 (3), 123-28. https://doi.org/https://doi.org/10.32508/stdj.v19i3.585.