"Locally self-similar phase diagram of a disordered Potts model on a
hierarchical lattice"
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The Potts model with bond disorder is studied in the limit of a infinite number
of states on a hierarchical lattice. 
This model is "academical" since neither the hierarchical lattice nor the
infinite number of states are really
physical. However the final result, ie the phase diagram of the model obtained
by renormalization, is unusual and
can justify this study.