Key points are not available for this paper at this time.
The mean-field equations of the Ising model with competing interactions are studied by means of an iteration procedure. It is found that the phase diagram consists of regimes with stochastic behavior, indicating a complete "devil's staircase" with pinned configurations only, and analytic regimes where commensurate pinned phases are separated by incommensurate phases with Goldstone modes.
Per Bak (Mon,) studied this question.