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http://gojapan.about.com/es/chuburegion4/a/ninja.htm

http://www.bbc.co.uk/dna/h2g2/A575642/

http://people.howstuffworks.com/ninja4/htm

http://www.skhquest.com/articles/ancientmodernninjutsu.aspt

http://www.thekeep.org/~kunoichi/kunoichi/themestream/kunoichi.html

http://www.hair-flap.com/2003/03-24-03.html