1. H. Franz, B. Haustein, P. Luther, U. Kuropka and A. Kindt, Acta biol. med. germ.36, 113 (1977).
2. P. Ziska, H. Franz and A. Kindt, Experientia34, 123 (1978).
3. P. Ziska and H. Franz, Experientia35, 161 (1979).
4. G. Takatsy, Symp. Ser. Immunobiol. Stand.4, 275 (1967).
5. J.K.N. Jones and Y. Tanaka, Meth. Carbohydr. Chem.5, 132 (1965).