Journal of the Physical Society of Japan 59 (1990) pp. 2230-2236 Low Temperature Properties of the Double Layer Quantum Heisenberg Antiferromagnet -Modified Spin Wave Method- Kazuo Hida Journal of the Physical Society of Japan 61 (1992) pp. 4547-4558 SU(2) Coherent State Path Integral Formulation of Nonlinear Collective Modes of Magnons in Heisenberg Antiferromagnets –Self-Localized Magnons and Vortices– Shozo Takeno and Kazuko Kawasaki Progress of Theoretical Physics Vol. 27 No. 6 (1962) pp. 1284-1285 On the Transformation Leading to Dyson's Ideal Hamiltonian of Ferromagnets Janusz Morkowski
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Takehiko Oguchi (1961) studied this question.
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