The low-frequency magnetoplasma resonance ("whistler" or "helicon") has been studied in rectangular parallelepiped samples of Na at 4^∘{}K using improved measuring techniques and higher magnetic fields in order to obtain greater resolution. Structure in the resonance was observed as satellites of the previously reported resonances. The observed frequencies of these satellites fit the simple formula reported earlier.
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Merrill et al. (1963) studied this question.