1. D. H. Erwin, J. Valentine, D. Jablonski, Am. Sci.85, 126 (1997).
2. G. M. Narbonne, GSA Today8, 1 (1998).
3. Life on a Young Planet: The First Three Billion Years of Evolution on Earth 2003
4. Three-dimensional preservation of algae and animal embryos in a Neoproterozoic phosphorite
5. M. A. Fedonkin, in The Vendian System, B. S. Sokolov, A. B. Iwanowski, Eds. (Springer-Verlag, Heidelberg, 1990), vol. 1, pp. 132–137.