1. On the origins of cells: a hypothesis for the evolutionary transitions from abiotic geochemistry to chemoautotrophic prokaryotes, and from prokaryotes to nucleated cells;Martin;Philosophical Transactions of the Royal Society of London Series B-Biological Sciences,2003
2. W. Zimmerman, S. Bryant, et al., A radioisotope powered cryobot for penetrating the European ice shell, AIP American Institute of Physics Conference Proceedings, no. 552, USA, 2001, pp. 707–715.
3. Design of particle bed reactor for space nuclear thermal propulsion program;Ludewig;Progress in Nuclear Engineering,1966
4. J. Powell, G. Maise, et al., MITEE: an ultra-lightweight nuclear engine for new and unique planetary science and exploration missions, 49th International Astromical Congress, Melbourne, Australia, 1998.
5. J. Powell, G. Maise, et al. Phase I - Final Report, Lightweight High Specific Impulse (1000s) Space Propulsion System, Plus Ultra Technologies and State University of New York, Stony Brook, 1999.