1. F. W. Hirth et al., Werkstoffe u. Korrosion,23, No. 5, 356 (1972).
2. Watanabe Masaki et al., Esetsu Gakkaisi (J. Jap. Weld. Soc.),39, No. 6, 11 (1970).
3. Watanabe Masaki et al., Bose Hidzyutsu (Corrosion Eng.),20, No. 9, 405 (1971).
4. G. V. Karpenko et al., Fiz.-Khim. Mekh. Mater., No. 3 (1969).
5. G. V. Karpenko et al., Fiz.-Khim. Mekh. Mater., No. 1 (1971).