1. Adushkin, V.V. & Nemtchinov, I.V. (1994) Consequences of impacts of cosmic bodies on the surface of the Earth, in Hazards Due to Asteroids and Comets, ed. Gehrels, T.,University of Arizona Press, Tucson, pp. 721–778 .
2. Alvarez, L.W., Alvarez, W., Asaro, F. & Michel, H.V. (1980) Extraterrestrial cause of the Cretaceous/Tertiary extinction, Science 208, 1095–1108 .
3. Alvarez, W. & Muller, R.A. (1984) Evidence from crater ages for periodic impacts on the Earth, Nature 308, 718–720 .
4. Bahcall, J.N., Flynn, C. & Gould, A. (1992) Local dark matter from a carefully selected sample, Astrophys. J. 389, 234–250 .
5. Bailey, M.E., Clube, S.V.M. & Napier, W.M. (1990) The Origin of Comets, Pergamon,Oxford, 577 p .