1. Lapteva, A., World market of tungsten today, Nats. Metall., 2003, no. 4, pp. 39–44.
2. Lapteva, A.M., The situation on the world tungsten market and the potential of the Russian raw material base of tungsten, Otechestvennaya Geol., 2018, no. 1, pp. 29–39.
3. Klyachko, L.I. and Leitman, M.S., Tungsten scrap: recycling technology Russian market, Tsvetn. Met., 2005, no. 3, pp. 101–104.
4. Bondarenko, V.P., Martynova, L.M., and Galkov, A.V., Processing of scrap of hard alloys of K group (a review), Porodorazrushayushchii Metalloobrab. Instrum.—Tekhn. Tekhnol. Izgotovleniya Primen., 2007, no. 10, pp. 387–392.
5. Vyacheslavov, A.V., Bichaev, V.B., Titova, A.D., et al., ICP-AES analysis of secondary tungsten-containing raw materials for production of hard alloys, Inorg. Mater., 2018, vol. 54, no. 14, pp. 1430–1434.