1. Abramovici, A., Althouse, W. E., Dreyer, R. W. P., Gursel, Y., Kawamura, S., Raab, F. J., Shoemaker, D., Sievers, L., Spero, R. E., Thorne, K. S. (1992) Science, 256, 325.
2. Baffles, M. (1996) Compact Stars in Binaries, I. A. U. Symposium no. 165, Kluwer Academic Publishers, Netherlands, eds. J. van Paradijs, E. P. J. van den Heuvel, E. Kuulkers, 213.
3. Baym, G., Pethik, C., Pines, D., Ruderman, M. (1969) Nature, 224, 872.
4. Bhawal, B.(1998) See chapter 27 in this volume.
5. Becker, W., Aschenbach, B. (1995) The Lives of the Neutron Stars, Kluwer Academic Publishers, NATO ASI Series, eds. M. A. Alpar, U. Kiziloglu, J. van Paradijs, 47.