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2. Liu Guangzhi, Diamond Drilling Handbook, Geological Publishing House, Beijing, 1992, p. 120.
3. Peng Xilin, Lü Haibo, Powder Metallurgy Technique 10 (1) (1992) 3 (in Chinese).
4. E. Brandes, A. Smithells, Metals Reference Book, 6th ed., Butterworth, Guildford, UK, 1983, pp. 11–224.
5. Zhang Yinqui, Ding Huadong, J. Cent. South Inst. Min. Metall. 22 (3) (1991) 283 (in Chinese).