1. A. G. Gurevich, Ferrites at Superhigh Frequencies [in Russian], Fizmatgiz, Moscow (1960). p. 307.
2. H. Pfeiffer and W. Haubenreisser, Phys. Stat. Sol. (b),62, No. 2, K87 (1974).
3. Yu. V., Gulyaev and S. A. Nikitov, 7th Intern. Conf. on Microwave Ferrites. Conference Transactions (1984), p. 46.
4. R. E. Camley and A. A. Maradudin, Phys. Rev. Lett.,49, No. 2, 168 (1982).
5. Ya. A. Monosov, Radiotekh. elektron.,5, No. 1, 59 (1960).