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2

G.F. Joyce: ``Ribozymes -- building the RNA world.'' Current Biology, Vol. 6, pp 965-967, 1996.

3

D. H. Lee, K. Severin, Y. Yokobayashi, and M.R. Ghadiri: ``Emergence of symbiosis in peptide self-replication through a hypercyclic network.'' Nature, Vol. 390, pp 591-594, 1997.

4

D.H. Lee, J.R. Granja, J.A. Martinez, K Severin, and M.R. Ghadiri: ``A self-replicating peptide.'' Nature, Vol. 382, pp 525-528, 1996.

5

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6

R.W. Roberts and J.W. Szostak: ``RNA-peptide fusions for the in vitro selection of peptides and proteins.'' Proceedings of the National Academy of Science USA, Vol. 94, pp 12297-12302, 1997.

7

K. Severin, D.H. Lee, J.A. Martinez, M. Vieth, and M.R. Ghadiri: ``Dynamic error correction in autocatalytic peptide networks.'' Angewandte Chemie International Edition, Vol. 37, pp 126-128, 1998.

8

S. Yao, I. Ghosh, R. Zutshi, and J. Chmielewski: ``Selective amplification by auto- and cross-catalysis in a replicating peptide system.'' Nature, Vol. 396, pp 447-450, 1998.