REFERENCES

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Foster, Robert J. Historical Geology. Prentice-Hall Inc., New Jersey, 1991.

Minelli, A. Biological Systematics. Chapman & Hall Inc., London, 1993.

Panchen, Alec L. Classification Evolution and the Nature of Biology. Cambridge University Press, New York, 1992.

Patterson, T. [http://www.carleton.ca/~tpatters /teaching
/paleo/paleogate.html] last updated 1997.