Periodic and weakly periodic ground states for the Potts model with competing interactions on the Cayley tree
Matematičeskie trudy, Tome 18 (2015) no. 2, pp. 112-132

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We consider the Potts model with competing interactions on the Cayley tree of order $k$ with $k\geq 2$. We describe the sets of periodic and weakly periodic ground states corresponding to normal subgroups of the group representation of the Cayley tree of index $4$.
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     author = {M. A. Rasulova and M. M. Rahmatullaev},
     title = {Periodic and weakly periodic ground states for the {Potts} model with competing interactions on the {Cayley} tree},
     journal = {Matemati\v{c}eskie trudy},
     pages = {112--132},
     publisher = {mathdoc},
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M. A. Rasulova; M. M. Rahmatullaev. Periodic and weakly periodic ground states for the Potts model with competing interactions on the Cayley tree. Matematičeskie trudy, Tome 18 (2015) no. 2, pp. 112-132. http://geodesic.mathdoc.fr/item/MT_2015_18_2_a6/