Biography of George Cantor:
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Cantor.html
A history of set theory:
http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/
Beginnings_of_set_theory.html
A brief note on set theory:
http://www.math.utah.edu/~alfeld/math/sets.html
An introduction of set theory:
http://plato.stanford.edu/entries/set-theory/
Axiomatic set theory:
http://en.wikipedia.org/wiki/Axiomatic_set_theory
Online book
What is Mathematics: Godel's Theorem and Around
http://www.ltn.lv/~podnieks/gt.html
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