Spin waves in ferromagnets and antiferromagnets. I
A.I. Akhiezera,
V.G. Bar’yakhtar,
M.I. Kaganovb aNational Scientific Centre ‘Kharkov Physicotechnical Institute’, ul. Akademicheskaya 1, Kharkov, 310108, Ukraine bKapitza Institute of Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation