1. Abelson, P. H.: 1966,Proc. Nat. Acad. Sci. USA 55, 1365–1372.
2. Baltscheffsky, H.: 1993, inChemical Evolution: Origin of Life, Ponnamperuma, C. and Chela-Flores, J. (eds.), 13–23.
3. Bartlett, P. D. and Davis, R. E.: 1958,J. Am. Chem. Soc. 80, 2513–2516.
4. Beck, A. and Orgel, L. E.: 1965,Proc. Nat. Acad. Sci. 54, 664–667.
5. Bernstein, M. P., Allamandola, L. J., Sandford, S. A. and Chang, S.: 1994,Abstracts of papers, 207th A.C.S. National Meeting, San Diego, CA, March 13–17.