1. Procurement Specification MC901-0089 for ULLAGE Motors, S&ID, NAA, 12214 Lakewood Blvd., Downey, Calif., (July 25, 1964).
2. File No. 5777-6901-T0-S-1, ULLAGE, Inert Vibration, Data Reduction Group, Engineering Test Section, Eng. Dept., Rocketdyne, McGregor, Tex. (March and April, 1965).
3. Crandall, S. H., Random Vibration, MIT Press, Massachusetts Institute of Technology, Cambridge, Mass. (Vol. I, 1958 and Vol. II, 1963).
4. Crandall, S. H. andMark, W. D., Random Vibration in Mechanical Systems, Academic Press, New York (1963).
5. Morrow, C. T., Shock and Vibration Engineering, I, John Wiley and Sons, Inc., New York (1963).