N. Y. Golovchenko, O. S. Bairakova, G. I. Ksandopulo, and S. K. Aknazarov, “Reception Ferrotungsten from Wolframite Concentrate by Alumimotermic Method”, Eurasian Chem.-Technol. J., vol. 13, no. 3-4, pp. 205–212, Dec. 2011.