1. 1R.J. Noble, Radioisotope Electric Propulsion of Small Payloads for Regular Access to Deep Space, AIAA 93-1897, 29th Joint Propulsion Conference, Monterey, California, 1993
2. 3R.J. Noble, Radioisotope electric propulsion of science-craft to the outer Solar System and near-interstellar space, Proceedings 2nd IAA Symposium on Realistic Near-Term Advanced Scientific Space Missions, June 1998 Aosta (Italy), FERMILAB-Conf-98/231, 1998.
3. 4S.R.Oleson, S. Benson, L. Gefert, M. Patterson,J. Schreiber, Radioisotope Electric Propulsion for Fast Outer Planetary Orbiters, AIAA-2002-3967, 38th Joint Propulsion Conference, Indianapolis, Indiana, 2002.
4. 5S.R. Oleson, L. Gefert, M. Patterson, J. Schreiber, S. Benson, J. McAdams, P. Ostdiek, Outer Planet Exploration with Advanced Radioisotope Electric Propulsion, IEPC-2001-0179, 27th International Electric Propulsion Conference, Pasadena, California, 2001.