Литература.
Pro
1. Shaviv astro-ph/0207637  astro-ph/0209252
                astro-ph/0306477  astro-ph/0409123
2. Kirkby et al. physics/0407005
3. R. de la Fuentes, C. de la Fuentes astro-ph/0405451
4. Gies & Helsel astro-ph/0503306