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3. D. Lupton, W. Schiffmann, F. Schreiber, E. Heitz, in: Proceedings of the 8th International Congress on Metallic Corrosion, Mainz, Germany, vol. 2, 1981, p. 1441.
4. D. Lupton, F. Aldinger, in: Proceedings of the 10th Plansee Seminar, Reutte, Austria, vol. 1, 1981, p. 101.