A Multicanonical Algorithm and the Surface Free Energy in SU(3) Pure   Gauge Theory
  We present a multicanonical algorithm for the SU(3) pure gauge theory at the deconfinement phase transition. We measure the tunneling times for lattices of size L^3x2 for L=8,10, and 12. In contrast to the canonical algorithm the tunneling time increases only moderately with L. Finally, we determine the interfacial free energy applying the multicanonical algorithm. 
B.Grossmann, M.L.Laursen, T.Trappenberg, U.-J.Wiese