1. 1. Nazarenko, O.K., Kajdalov, A.A., Kovbasenko, S.N. et al. (1987) Electron beam welding. Kiev, Naukova Dumka [in Russian].
2. 2. Agarkov, V.Ya., Trofimova, K.G. (1983) Porosity of welds in electron beam welding of copper. In: Technology, organization of labour, production and monitoring. Ser.: Tekhnologiya, Organizatsiya i Mekhanizatsiya Mekhanosborochnogo i Svarochnogo Proizvodstva, 12, 1-4 [in Russian].
3. 3. Nazarenko, O.K., Agarkov, V.Ya., Ikonnikov, V.I. (1986) Infl uence of method of edge preparation on pore formation in weld during electron beam welding. Avtomatich. Svarka, 2, 21-25 [in Russian].
4. 4. Agarkov, V.Ya. (1982) Porosity in electron beam welds (Review). Ibid., 2, 63-68 [in Russian].
5. 5. Ilyushenko, V.M., Lukyanchenko, E.P. (2013) Welding and surfacing of copper and alloys on its base. Kiev, IAW [in Russian].