Lattice Calculation of QCD Vacuum Correlation Functions
  The first exploratory calculations of QCD vacuum correlation functions on a lattice are reported. Qualitative agreement with phenomenological results is obtained in channels for which experimental data are available, and these correlation functions are shown to be useful in exploring approximations based on sum rules and interacting instantons. 
M.-C. Chu, J. M. Grandy, S. Huang and J. W. Negele