1. For review, A. Vilenkin, E.P.S. Shellard, Cosmic Strings and Other Topological Defects, Cambridge University Press, New York, 1994.
2. Electroweak String Configurations with Baryon Number
3. B violation with sphalerons and electroweak strings
4. R.H. Brandenberger, A.-C. Davis, Phys. Lett. B 308 (1993) 79. R.H. Brandenberger, A.-C. Davis, Phys. Lett. B 332 (1994) 305.
5. M. Nagasawa, C.S. Aulakh, V. Soni, Proceedings of the 3rd RESCEU International Symposium on PARTICLE COSMOLOGY, K. Sato, T. Yanagida, T. Shiromizu (Eds.), Universal Academy Press, Tokyo, 1998, p. 269.