u(x,y),v(x,y)
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Recent Referers:
  1. http://formula.s21g.com/?u(x,y),v(x,y)
  2. http://formula.s21g.com/
  3. http://blog.s21g.com/articles/2012.8
  4. http://t.co/vp5cjh6R0n
  5. http://blog.s21g.com/lvs?fb_locale=pt_BR