Geodesic
Hierarchical vector model of a ferromagnet in the method of collective variables. The Lee–Yang theorem
Teoretičeskaâ i matematičeskaâ fizika, Tome 58 (1984) no. 1, pp. 96-108 Cet article a éte moissonné depuis la source Math-Net.Ru

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A hierarchical vector model of a ferromagnet that approximates the corresponding translationally symmetric model with two-body interaction of arbitrary range is proposed. For such a model of arbitrary vector dimension it is shown that the zeros of the partition function are localized on the imaginary axis of magnetic field values. A sufficient condition is also proved for block-spin distributions whose partition functions have such a property. 
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Yu. V. Kozitskii. Hierarchical vector model of a ferromagnet in the method of collective variables. The Lee–Yang theorem. Teoretičeskaâ i matematičeskaâ fizika, Tome 58 (1984) no. 1, pp. 96-108. http://geodesic.mathdoc.fr/item/TMF_1984_58_1_a7/

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