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We unify the method of exchange perturbation theory for multicenter systems. For the case ofexchange degeneracy in the total spin of the system we give a seqular equation. On the basis of thisformalism we develop an algorithm for calculating the Heisenberg parameter for magnetic materials. Finally,we calculate the characteristics of antiferromagnetic transitions for the high-Tc materials La2-xMeCuO4 andYBa2Cu3O6.
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