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Continue to ChatTHE XYZ MODEL IN THE MEAN-FIELD APPROXIMATION IN TERMS OF PAULI SPIN MATRICES - https://avesis.erciyes.edu.tr/yayin/89352d5f-3c2f-4868-aff1-09051cd118fb/the-xyz-model-in-the-mean-field-approximation-in-terms-of-pauli-spin-matrices