1. Simon Ho. “The Molecular Clock and Estimating
Species Divergence”. 2008. http://www.nature.
com/scitable/topicpage/the-molecular-clock-andestimating-
species-divergence-41971.

2. Francisco J. Ayala. “Vagaries of the Molecular Clock”. PNAS 94, 15, (1997): 7776.

3. Motoo Kimura. “Evolutionary Rate at the Molecular Level”. Nature 217, (1968): 624-626.

4. Richard Dickerson. “The Structure of Cytochrome C and the Rates of Molecular Evolution”. J. Mol. Evol., l, (1971): 26-45.