1. Girgis, K.: Thesis at the Swiss Federal Institute of Technology, Zürich (1969).
2. Girgis, K. Mh. Chem.101, 721 (1970).
3. Girgis, K.: Naturwissenschaften57, 193 (1970).
4. Girgis, K.: A detailed report will be published elsewhere by Dr. R. Reinmann (Alusuisse, Neuhausen/Rh).
5. Meissner, H. G., Schubert, K.: Z. Metallk.56, 523 (1965).