Qiang, W., X. Junhui, Z. Yushu, C. Chao, C. Zhiqiang, D. Wei, L. Guanjie, and H. Wenxiao. “Phase Evolution and Cobalt and Sulfur Content of Complex Cobalt-Sulfur Concentrate During Oxidative Roasting”. Journal of Mines, Metals and Fuels, vol. 67, no. 8, Oct. 2022, pp. 371-7, http://informaticsjournals.com/index.php/jmmf/article/view/31644.