Renormalization group calculation of correlation functions of general Ising hamiltonians - Subbarao, K. (Elsevier)
Renormalization group concepts are useful in obtaining spin correlation functions for general Ising hamiltonians. A finite lattice approximation for correlations between spins too far apart to be in the same finite lattice illustrats this.
http://linkinghub.elsevier.com/retrieve/pii/0375-9601(76)90751-9
Keywords: U