1. European Hybrid Propulsion Theory by M.Calabro 29thAerospaceSciences Meetings Reno,NV. January 1991
2. The Development of a 200,000 Ibf Thrust Hybrid Rocket Booster by R. J. Kniffen and K.J. Flittie 42th Congress of the IAF Montreal Canada October 1991
3. 10The Aquila launch Service for Small Satellites by G.R. Whittinghill and B.C. McKinney 28thJoint Propulsion Conference and EhibitNashville,TN,July1992
4. 11The Opportunity for Hybrid Rocket Motors in Commercial Space by P. Estey and B.G.R. Hugues 28thJoint Propulsion Conference and Exhibit Nashville,TN July 1992