1. Low Power Hydrazine Arcjet Flight Qualification;Smith,1991
2. Readiness Appraisal: Ion Propulsion for Communication Satellites;Schrieb;AIAA Paper 88-0777,1988
3. Review of European Activities on Electric Propulsion;Bartoli,1991
4. Electric Propulsion Research and Development in Japan;Yoshikawa,1991
5. Electric Propulsion: An Evolutionary Technology;Curran;IAF Paper 91-241,1991