Key points are not available for this paper at this time.
Averintsev 1 and Spitzer 2 proved that the class of Markov fields is identical to the class of Gibbs ensembles when the domain is a finite subset of the cubic lattice and each site may be in either of two given states. Hammersley and Clifford 3 proved the same result for the more general case when the domain is the set of sites
Geoffrey Grimmett (1973) studied this question.