1. W.-M. Yao et al. (Particle Data Group), J. Phys., G33, 1 (2006), and 2007 update.
2. T. Padmanabhan, Phys. Rep., 380, 235 (2003).
3. S. D. Roberts and A. G. Williams, Prog. Part. Nucl. Phys., 33, 477 (1994).
4. M. Tegmark et al., Phys. Rev., D74, 123507 [astro-ph/0511774] (2006).
5. S. A. Kononogov, V. N. Mel'nikov, and V. V. Khrushchev, Izmer. Tekh., No. 3, 3 (2007);