1. Degens, E.T., Van Bonsart, G., How Kin Wong, Khoo, F., and Dickmann, M.D.: 1979. Environmental parameters responsible for the fixation of uranium in recent sediments: test area Bow Lake, Ontario, Canada. Mitt. Geol.-Palaont. Inst. Univ. Hamburg 49, pp. 27–60.
2. Dubos, R.: 1979. Gaia and creative evolution. Nature 282, pp. 154–155.
3. Ehrlich, H.L.: 1981. Geomicrobiology. XIII, + 393 pp.Dekker, New York-Basel.
4. Ernst, W.H.O. (ed.): 1981. Heavy Metals in the Environment. International Conference, Amsterdam.
5. Faústo da Silva, J.J.R., and Williams, R.J.P.: 1978. The uptake of elements by biological systems. In: New Trends in Bio-inorganic Chemistry ( Williams, R.J.P., and Fausto da Silva, J.J.R., eds.), Academic Press, London.