1. Ögelman, H. in Isolated Pulsars (eds Van Riper, K. A., Epstein, R. I. & Ho, C.) 98–102 (Cambridge Univ. Press, 1993).
2. Goldreich, P. & Julian, W. Astrophys. J. 157, 869–880 (1969).
3. Cheng, K. S., Ho, C. & Ruderman, M. Astrophys. J. 300, 500–539 (1986).
4. Chiang, J. & Romani, R. W. Astrophys. J. 400, 629–637 (1992).
5. Ruderman, M., Chen, K., Cheng, K. S. & Halpern, J. P. Astrophys. J. (submitted); also as Columbia Univ. Astrophys. Lab. preprint No. 510.