1. G. Zigeuner, H. Brunetti, H. Ziegler undM. Bayer, Mh. Chem.101, 1767 (1970).
2. G. Zigeuner, V. Eisenreich, H. Weichsel undW. Adam, Mh. Chem.101, 1731 (1970).
3. G. Zigeuner undG. G�bitz, Mh. Chem.101, 1547 (1970).
4. G. Zigeuner, M. Bayer, F. Paltauf undE. Fuchs, Mh. Chem.98, 22 (1967).
5. G. Zigeuner, A. Frank, H. Dujmovits undW. Adam, Mh. Chem.101, 1415 (1970).