1. AIAA Paper 96-2715, July 1996, and References therein.
2. Evaluation of the United Kingdom ion thruster
3. Fearn, D.G. "Ion Thrusters Lifetime Limitations Imposed by Sputtering Processes," IEPC Paper 93-177,
4. Thruster Grdis-Improvement of Structural Strength," IEPC Paper 97-093, August 1997.