Christian, J.; Singh Gaur, R.P.; Wolfe, T.; Trasorras, J. R. L. Tungsten Chemicals and their Applications(PDF). International Tungsten Industry Association. June 1, 2011: 1–12 [February 19, 2023]. (原始内容存档(PDF)于2023-04-08).
Christian, J.; Singh Gaur, R.P.; Wolfe, T.; Trasorras, J. R. L. Tungsten Chemicals and their Applications(PDF). International Tungsten Industry Association. June 1, 2011: 1–12 [February 19, 2023]. (原始内容存档(PDF)于2023-04-08).