1. ‘Aerospace America’ (1989) ‘Nuclear thermal rockets: next step into space’, by S.K. Borowski, E.A. Gabris, and J. Martinell, p. 17; ‘The beginnings’, by R.J. Bohl, W.L. Kirk, and R.R. Holman, p. 18; ‘Mars mission safety’, by D. Buden, p. 22, June 1989.
2. ‘Aerospace America’ (2000) Joint Propulsion Meeting Program, April 2000, pp. B64 and B70.
3. ‘Aerospace America’ (2004) Roundtable discussion on NP, November 2004; see it also at: http://boss.streamos.com/wmedia/federal/aiaa/aiaa081004.wvx
4. Alta (2003) ‘Technology and System Options towards Megawatt Level Electric Propulsion’, Proceedings of the International Workshop held on 9–10 June 2003, Lerici, Italy. CD-ROM available from alta@alta-space.com
5. Andrenucci, M. (2004) ‘Prospective Needs and Technology Options for High Power Devices’, Paper presented at the International Symposium on Energy Conversion Fundamentals, 21–25 June 2004, Istanbul. Also available from alta@alta-space.com