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4. M. A. Shamsutdinov, V. N. Nazarov, I. Yu. Lomakina, et al., Ferro- and Antiferromagnetic Dynamics: Nonlinear Oscillations, Waves, and Solitons (Nauka, Moscow, 2009) [in Russian].
5. G. L. Alfimov, “Nonlocal sine-Gordon equation: Kink solutions in the limit of weak nonlocality,” Nelin. Din. 5, 585–602 (2009).