1. Coates, M.I., Fish fins or tetrapod limbs—a simple twist or fate?, Cur. Biol., 1995, vol. 5, no. 8, pp. 844–848.
2. Hinchliffe, J.R., Tidball, P., Staughton, T.J., Wade, S., and Vorobyeva, E.I., New immunohistochemical methods and their use for evolutionary-developmental analysis of heterochronic transformation of the patterns of limb skeletal development in tailed amphibians, Herpetology, 1999, vol. 5, no. 10, pp. 173–182.
3. Hinchliffe, J.R., Vorobyeva, E.I., and Geraudie, J., Is there a tetrapod developmental bauplan underlying limb evolution: Evidence from a teleost and from urodele and anuran amphibians?, in Major Events in Early Vertebrate Evolution, Ahlberg, P.E., Ed., London: Taylor Francis Books, John Wiley, 2001, pp. 377–391.
4. Holmgren, N., On the origin of the tetrapod limb, Acta Zool., 1933, vol. 14, pp. 185–295.
5. Franssen, R.A., Marks, S., Wake, D., and Shubin, N., Limb chondrogenesis of the supuge Salamander Des moorigin gnathus seneus (Amphibia: pletodontidas), J. Morphol., 2005, vol. 265, pp. 87–101.