1. Abramov, O., and Mojzis, S., 2009. Microbial habitability of the Hadean earth during late heavy bombardment. Nature, 459, 419–422.
2. Abyzov, S. S., Mitskevich, I. N., Poglazova, M. N., Barkov, N. I., Lipenkov, V. Ya., Bobin, N. E., Koudryashov, B. B., Pashkevich, V. M., and Ivanov, M. V., 2001. Microflora in the basal strata at anatarctic ice core above the vostok lake. Advances in Space Research, 28, 701–706.
3. Amend, J. P., and Teske, A., 2005. Expanding frontiers in deep subsurface microbiology. Palaeogeography, Palaeoclimatology, Palaeoecology, 219, 131–155.
4. Amy, P. S., 1997. Microbial dormacy and survival in the subsurface. In Amy, P., and Haldeman, D. (eds.), The Microbiology of the Terrestrial Subsurface. Boca Raton: CRC Press, pp. 185–203.
5. Bailey, N. J. L., Jobson, A. M., and Rogers, M. A., 1973. Bacterial degradation of crude oil: Comparaison of field and experimental data. Chemical Geology, 11, 203–221.