1. A. Africano, Advances in Cryogenic Engineering, Vol. 5, K. D. Timmerhaus (ed.), Plenum Press, New York (1960), p. 533.
2. Rept. DSN-TR-2–58, Huntsville, Alabama, and ASTM Bull., No. 244;WR Lucas,1960
3. U.S. Air Force Specification, Bulletin 527, Aeronautical Systems Division, Wright-Patterson Air Force Base, Ohio (1961).
4. ASD Technical Report 61–324, Aeronautical Systems Division, Air Force Systems Command. U.S. Air Force, Wright-Patterson AFB;RL Hauser,1961