1. Plasma Oscillations and Landau Damping in a Relativistic Gas
2. Relativistic Effects on Plasma Oscillations and Two-Stream Instability. II
3. Waves in a Plasma in a Magnetic Field
4. Similar relation has been obtained by I. B. Bernstein, using cylindrical polar coordinates, with a slight difference in notation (private communication).
5. R. C. Tolman,Relativity, Thermodynamics, and Cosmology(Clarendon Press, Oxford, England, 1934) Chap. V.