References

[1] BERNAL, M., [1991]. Black Athena, Vintage, London.

[2] CASSELMAN, B, YBC 7289 - photograph from the Yale Babylonian collection, http://www.math.ubc.ca/people/faculty/cass/Euclid/ybc/ybc.html.

[3] IFRAH, G., [2000]. The Universal History of Numbers, Wiley, New York.

[4] JOYCE, D.E. [1995]. Plimpton 322, http://aleph0.clarku.edu /$\tilde{}$djoyce /mathhist /plimpnote.html.

[5] KAPLAN, R., [1999]. The Nothing that is: A natural history of zero, Oxford, New York.

[6] MUKHERJEE,R., [1991]. Discovery of zero and its impact on Indian mathematics (Calcutta)

[7] O'CONNOR, J.J. and E.F. ROBERTSON, [2000]. Pythagoras's theorem in Babylonian mathematics, http://www-groups.dcs.st-and.ac.uk /$\tilde{}$history /HistTopics /BabylonianPythagoras.html.