1. Eggers, A. J., Jr., Alien, H. J., and Neice, S. E. "A comparative analysis of the performance of long-range hypervelocity vehicles/7NACA TN-4046 (1957).
2. Norman, W. S. "Improvements to the Alien and Eggers solution for ballistic re-entry," U. S. Air Force Rept. USAFA-TN63-2(1963).