1. The deep, hot biosphere.
2. The deep subterranean biosphere
3. Zvyagintsev, D.G., Gilichinsky, D.A., Blagodatsky, S.A., Vorobyova, E.A., Khlebnikova, G.M., Arkhangelov, A.A. and Kudryavtseva, N.N. (1985) The time of microbial preservation in constantly frozen sedimentary rocks and buried soils. Mikrobiologiya 54, 153–163 (in Russian).
4. Mishustin, E.N. and Emtsev, B.T. (1978) Microbiologiya. Kolos, Moscow (in Russian).
5. Zvyagintsev, D.G. (1987) Soil and Microorganisms. MSU, Moscow (in Russian).