Revised by: H Baumann, R Beckmann, R Dallmayr, H Dvrner, M Gruber, F Harrer, K Hohlfeld, T Honsell, M H]bsch, A Riedler, W -H Roth, M Schauer, H -P Schwintowski, A Staudinger, W Voit, H Darner, M Ha1/4bsch, H Dorner, M Hubsch, H D Rner