1. Boyanovsky, D., Brahm, D.E., Gonzalez-Ruiz, A., Holman, R., Takakura, F.I.: arXiv: hep-ph-9501380 (1995)
2. Basu R., Vilenkin A.: arXiv: gr-qc/9402040 (1993)
3. Vilenkin, A., Shellard, E.P.S.: Cosmic strings and other topological defects. Cambridge University Press, Cambridge (1994)
4. Kolb, E.W., Turner, M.S.: The Early Universe. Addison Wesley, Massachusetts (1990)
5. Bamba, K., Nojiri, S., Odintsov, S.D.: arXiv: 1107.2538v2 (2012)