Osotchan, T., S. Thongmee, and I. M. Tang. “On The Coercivity of the Bi-Doped Ba-Hexaferrite, BaFe12-xBixO19”. Science & Technology Asia, vol. 4, no. 3, Nov. 2015, pp. 54-58, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41935.