1. Weak nonlinear electromagnetic waves and low-frequency magnetic-field generation in electron-positron-ion plasmas
2. Creation and uses of positron plasmas*
3. H. R. Miller and P. J. Witta ,Active Galactic Nuclei( Springer-Verlag, Berlin, 1987), p. 202.
4. W. Misner , K. S. Thome , and J. A. Wheeler ,Gravitation( Freeman, San Francisco, 1973), p. 763.
5. Pulsar Electrodynamics