1. M.M. Cohen, Carbon Radiation Shielding for the Habot Mobile Lunar Base, SAE Technical Paper Series, SAE International, Warrendale, 2004.
2. Alcatel, “International Space Station habitable modules: developing human life in space” 〈http://www.alcatel.com/com/en/apphtml/atrarticle/2006q2internationalspacestationhabitablemodulesdevelopinghumanlifeinspaceinternationalhtmltcm172915141635.jhtml〉.
3. I. Boblan, R. Bannasch, First International Industrial Conference Bionik 2004, held attendant to the Hannover Messe, Hannover, Germany, VDI Verlag GmbH, Düsseldorf, 2004.
4. R.H.C. Bonser, W.S. Harwin, W. Hayes, G. Jeronimidis, G.R. Mitchel, C. Santulli, Final Report: EAP-based artificial muscles as an alternative to space mechanisms, The University of Reading, June 2004.
5. CDF Study Executive Summary, Human Missions to Mars, Overall Architecture Assessment, ESA, February 2004.