1. L.D. Landau: J. Phys. (USSR) 10, 25 (1946)
2. M.A. Leontovich: Sov. Phys. JETP 13, 634 (1961)
3. D.B. Melrose, R.J. Stoneham: J. Phys. A 10, L17 (1977)
4. T.H. O’Dell: The Electrodynamics of Magneto-electric Media, (North-Holland, Amsterdam 1970)
5. R.A. O’Sullivan, H. Derfler: Phys. Rev. A 8, 2645 (1973)