Balbín, A. (2004), “Seres vivos: sistemas cognitivos”, Biólogos lejos del equilibrio. Nuevas metáforas evolutivas. Grupo de Biología Teórica. Bogotá, pp. 89-106.

Burbano, H. and Andrade, E. (2007), “Analysis of tARN abstract shapes of precursor/derivative aminoacids in Archaea,” submitted to GENE.

Caetano, G. (2002), “Evolved ARN secondary structure and the rooting of the universal tree of life,” J. Mo.l Evol. 54: 333-345.

Durban, R; Eddy, S; Krogh, A; Mitchison, G. (1998), Biological Sequence Analysis. Probabilistic Models of Proteins and Nucleic Acids. Cambridge Univ. Press. UK.

Fontana, W. (2001), Novelty in Evolution. Green Paper for Bio-Evolutionary Advanced Concepts for NASA (BEACON). Santa Fe Institute.

Fox, S. (1984), “Proteinoid experiments and evolutionary theory,” in Beyond Neodarwinism. Academic Press. London, pp. 15-60.

Gayon, J. (1994), “La marginación de la forma en la biología darwiniana,” Ciencias UNAM: 34: 30-34.

Goodwin, B. (19989, Las manchas del leopardo. La evolución de la complejidad. Tusquets editores. Barcelona.

Kauffman, S. (2003), Investigaciones. Tusquets editores. Barcelona.

Miramontes, P. (1996), “La geometría de las formas vivas,” Ciencias, UNAM: 42: 1-8.

Monod, J. (1989), Azar y necesidad. Tusquets editores. Barcelona.

Moreira, A. (2003), “ARN rings in the origin of life,” CDMTCS Research.

Schultes, E., Hraber, P., Labean, T. (1999), “Estimating the contributions of selection and self-Organization in ARN Secondary Structure,” J. Mol. Evol. 49: 76-83.

Schuster, P; Fontana, W; Stadler, P; Hofacker. (1994), “From sequences to shapes and back: a case study in RNA secondary structures,” Proc. R. Soc. Lond. B. 255: 279-284.

Schuster, P. (1995), “How to search for RNA structures. Theoretical concepts in evolutionary biotechnology,” Journal of Biotechnology 41: 239-257.

Schuster, P; Fontana, W. (1999), “Chance and necessity in evolution: lessons from RNA,” Physica D 133: 427–452.

Vega, J.C. (2007), Análisis Estructural de ARNts de Aminoácidos Relacionados Metabólicamente (Precursores–Derivados) y su Correspondencia con un Último Ancestro Común Universal Hipotético dentro del dominio Archaea. Tesis de Maestría. Universidad Nacional de Colombia.

Woese. C. (1998), “The universal ancester,” Proc. Natl. Acad. Sci. USA. Vol. 95: 6854–6859.

Wong. J. (1980), “Role of minimization of chemical distances between aminoacids in the evolution of the genetic code,” Proc. Natl. Acad. Sci. 77(2): 1083-1086.

Wong, J. (2005), “Coevolution theory of the genetic code at age thirty,” BioEssays 27: 416–425.