Geodesic
Generalization of the minimax principle for model quasispin problems
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 258-265

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The free energy in the thermodynamic limit is investigated for model quasispin systems with positive and negative interaction. It is shown that the minimax principle [11] is valid in this case. 
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     author = {N. N. Bogolyubov (Jr.) and A. G. Shumovskaya and A. S. Shumovskii},
     title = {Generalization of the minimax principle for model quasispin problems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a10/}
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N. N. Bogolyubov (Jr.); A. G. Shumovskaya; A. S. Shumovskii. Generalization of the minimax principle for model quasispin problems. Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 2, pp. 258-265. http://geodesic.mathdoc.fr/item/TMF_1974_21_2_a10/