%0 Journal Article %A R. M. Khakimov %A K. O. Umirzakova %T Extremality of the unique translation-invariant Gibbs measure for hard-core models on the Cayley tree of order $k=3$ %J Teoretičeskaâ i matematičeskaâ fizika %D 2021 %P 112-124 %V 206 %N 1 %U http://geodesic.mathdoc.fr/item/TMF_2021_206_1_a5/ %G ru %F TMF_2021_206_1_a5