1. Tungsten sources;Yih,1979
2. Production of tungsten and tungsten carbide powders;Lux,1998
3. B. Williams, Powder metallurgy – a global market review, In: International Powder Metallurgy Directory & Yearbook, 12th edn 1, 2005/2006, pp 5–11.
4. Technical data, International Tungsten Industry Association.
5. Tungsten, tungsten alloys and tungsten compounds;Lassner,1992