1. G.J.E. Thompson, 3rd. Intern. Astronaut. Congress, Stuttgart, Oct. 1952.
2. E. Outten, U.S. Pat. 4 090 896; C.A. 89:131874y.
3. G. Von Elbe and E.T. McHale, Report 1980 AFOSR-TR-81-0255, Order No. AD-A096415, NTIS.
4. C.B. Baddiel and C.F. Cullis, Symp. Combust. 8th, Pasadena, CA 1089 (1960).