1. K. M. Gurevich (editor), Metallurgy and Technology of Welding Refractory Metals and Alloys Based on Them [in Russian], Naukova Dumka, Kiev (1982).
2. M. M. Nerodenko, I. I. Statkevich, and V. K. Shapran, ?A stand for inspecting the shielding atmosphere in welding refractory metals,? Avtomat. Svarka, No. 6, 12?15 (1981).
3. O. P. Bochkova and E. Ya. Shreider, Spectral Analysis of Gas Mixtures [in Russian], Gostekhizdat, Moscow (1963).
4. V. N. Gridnev, N. P. Kushnareva, and A. I. Solodkov, ?Effect of the composition of the atmosphere on gas saturation of the solid solution in welded joints in niobium alloys,? Fiz. Khim. Obrab. Mater., No. 3, 134?139 (1981).
5. V. I. Trefilov and A. F. Moiseev, Dispersed Particles in Refractory Metals [in Russian], Naukova Dumka, Kiev (1978).