1. C.Bartoli,G.Saccoccia, "EuropeanElectric Propulsion ActivitiesintheEraofApplication",IEPC-83-003,23rD IEPC,SeattleWSA), Sep.1993
2. H.Bassner, H.P.Berg, R.Kukies, H.Mliller,"FlightTest ResultsoftheRITAExperimentonEURECA",IEPC-93-102,23rdIEPC,Seattle(USA),Sep.1993
3. lI.Bassner,M,Silvi,L,vmHoItz,C.Bartoli,"IonPropulsion:aKeyEnableronESA'sDRTMProgmnme",IEPC93-059,23173IEPC,Seattle(USA),Sep.1993
4. 6, D.G.Feam,A.R.Martin,P.Smith,"IonPropdlsionDevelopmentin theUK",AIAA-93-2G03,29thJointPropul-sionConference,Monterey(USA),Jun.1993