Kenzhaliyev, B., S. Trebukhov, V. Volodin, Trebukhov А., and F. Tuleutay. “Selenium Extraction Out of Metallurgical Production Middlings”. Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources, vol. 307, no. 4, Oct. 2018, pp. 56-64, doi:10.31643/2018/6445.30.