Some problems, complete discussion of which would be extremely difficult, are treated approximately by means of perturbation theory. Among these are the partially filled cylindrical waveguide, and the problem of multiple internal reflections in a sample of finite length filling the cross section of a cylindrical guide. Propagation in a ferrite between parallel planes, magnetized along the propagation direction is discussed by the methods described in Part I. The paper concludes with an addendum to Part I — a numerical study of field patterns of the TE11-limit and TM11-limit mode for various dc magnetic fields.
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Suhl et al. (1954) studied this question.