1. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 5: Statistical Physics (Pergamon, London, 1958).
2. I. E. Dzyaloshinskii, Sov. Phys. JETP 10, 628 (1960).
3. D. N. Astrov, Sov. Phys. JETP 11, 708 (1960).
4. C. Ederer and N. A. Spaldin, Phys. Rev. B 76, 214404 (2007).
5. N. A. Spaldin, M. Fiebig, and M. Mostovoy, J. Phys.: Condens. Matter 20, 434203 (2008).