1. 2) H. Hlzbrecher, J.-P. Pfeifer, W. J. Quadakkers and W. Speier: Secondary Ion Mass Spectrometry SIMS VII, John Wiley & Sons (1992), 729.
2. 4) S. Tsukui, K. Kawabata, E. Yoden, Y. Kimura, H. Mizumoto, T. Fujino and M. Koiwa: 9th International Symposium on Superconductivity, (1996).
3. Combined effects of chromic acid ion and oxide powders on the hard coatings of aluminum oxide film by AC process.