Progress of Theoretical Physics Vol. 31 No. 3 (1964) pp. 335-356 Antiferromagnetic Spin Waves Kensuke Tani Progress of Theoretical Physics Vol. 33 No. 1 (1965) pp. 1-21 Green's Function Theory of Magnetic Relaxation. III Kazuhisa Tomita and Motoyuki Tanaka Progress of Theoretical Physics Vol. 46 No. 3 (1971) pp. 675-687 Frequency Shift and Damping Constant of Spin Waves in a Heisenberg Ferrimagnet with Uniaxial Anisotropy Makoto Takemura and Kensuke Tani
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K. Tani (1963) studied this question.