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2. 3AnAlternativeGeometryHybridRocketfor Spacecraft Orbit Transfer Manoeuvres G. Haag, M. Sweeting, G. Richardson IAF 200, Rio De Janeiro Brazil, 2-6Oct 2000
3. 7DevelopementofaGasFilmHTP/Kerosene Thruster for Small Satellites I. Coxhill, M.Sweeting, G.Richardson First International Conference onGreenPropellants for Space Propulsion Noordwijk, The Netherlands, June 2001