http://www.cnn.com/2004/US/West/01/07/math.mystery.ap/

http://www.mosnews.com/news/2004/09/06/math.shtml

http://mathworld.wolfram.com/PoincareConjecture.html

http://www.claymath.org/millennium/

http://scienceworld.wolfram.com/biography/Poincare.html

Poincare

algebraic curve

singular point