1. W. Misner, K. S. Throne, and J. A. Wheeler, Gravitation (Freeman, San Francisco, 1973), p. 763.
2. H. R. Miller and P. J. Witta, Active Galactic Nuclei (Springer-Verlag, Berlin, 1987), p. 202.
3. Pulsar Electrodynamics
4. Theory of pulsar magnetospheres