1. W. Misner, K. S. Thorne, 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