Conformal Field Theory Correlators from Classical Scalar Field Theory on   $AdS_{d+1}$
  We use the correspondence between scalar field theory on $AdS_{d+1}$ and a conformal field theory on $R^d$ to calculate the 3- and 4-point functions of the latter. The classical scalar field theory action is evaluated at tree level. 
Wolfgang Mueck and K.S. Viswanathan