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Additional information
Institute of Theoretical Physics, Academy of Sciences of the Ukrainian SSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 32, No. 1, pp. 114–119, July, 1977.
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Kharkyanen, V.N. Generalization of the Heisenberg Hamiltonian for a crystal with allowance for orbital degrees of freedom. Theor Math Phys 32, 632–636 (1977). https://doi.org/10.1007/BF01041438
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DOI: https://doi.org/10.1007/BF01041438