1. Bock, R., u. H. Deister: Naturwissenschaften 50, 496 (1963).
2. Bock, R., H.-T. Niederauer u. K. Behrends: diese Z. 190, 33 (1962).
3. vgl. Diamond, R. M., and D. G. Tuck: in: Progress in Inorganic Chemistry, New York, Intersci. Publ., Vol. II, 109 (1960) (Extraction of Inorganic Compounds into Organic Solvents).
4. Fischer, E. O., u. R. Böttcher: Chem. Ber. 89, 2397 (1956).
5. Fischer, E. O., and H. P. Fritz: in: Advances in Inorganic Chemistry and Radiochemistry, New York, Academic Press, Vol. 1, 55 (1959) (Compounds of Aromatic Ring Systems and Metals).