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2. I. E. Kontorovich and V. F. Kononova, "Effect of alloying elements on nitriding of Ti alloys," in: Technology, Heat Engineering, and Automation of Metallurgical Industries [in Russian], Metallurgiya, Moscow (1971), pp. 301?304.
3. A. Takamura, "Nitriding of titanium," Nihon Kinzoku Gakkaishi,24, No. 9, 565?569 (1960).
4. S. S. Kiparisov and Yu. V. Levinskii, Nitriding of Heat-Resistant Metals [in Russian], Metallurigya, Moscow (1972).