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Statement of the problem 721 2. Initial equations and their simplification 722 3. Solution of the linearized equations 724 4. Dispersion of longitudinal waves 728 5. Dispersion of longitudinal waves in an electron gas with a Fermi distribution function 730 6. Dispersion of transverse waves 732 7. Summary and conclusion 733
A. A. Vlasov (Sun,) studied this question.