An Improved Gaussian Approximation for Quantum Field Theory
  We present a new approximation technique for quantum field theory. The standard one-loop result is used as a seed for a recursive formula that gives a sequence of improved Gaussian approximations for the generating functional. In a different setting, the basic idea of this recursive scheme is used in the second part of the paper to substantialy speed up the standard Monte Carlo algorithm. 
Antun Balaz, Aleksandar Belic and Aleksandar Bogojevic (Institute of   Physics, Belgrade)