1. Dougherty, R. C.: This journal 1980
2. Gerike, P.: 1975, Naturwissenschaften 62, p. 38?39;
3. Broda, E.: 1979, Discussion remark at UNESCO meeting at Paris ?Cosmochemistry and Exobiology? and at DFG-Symposium at Schliersee ?Evolution of Planetary Atmospheres and Life?
4. Moertberg, L.: ?Net Chemical Asymmetry in Mixtures of Molecules Produced by Factors External to the Molecules? in: ?Origins of Optical Activity in Nature? (ed. D. C. Walker), Elsevier, Amsterdam 1979, p. 101?107
5. Haberditzl, W., Thiemann, W. and Jarzak, U.: 1980, in preparation