1. Rykalin, N., Uglov, A., Zuev, I. and Kokora, A., Laser and Electron Beam Treatment of Materials. Mashinostroeni, Moscow, 1985, p. 495.
2. Tong, H. and Gied, W., Welding J., 1970, 6, 259.
3. Arata, Y., Matsuda, F. and Murakami, T., Transaction of JWRI, 1973, 2, 23.
4. Weber, C., Funk, E. and McMaster, R., Welding J., 1972, 2, 90.
5. Mara, G., Funk, E., McMaster, R. and Dence, P., Welding J., 1974, 6, 53.