1. L. V. Spencer: National Bureau of Standards Monograph 42 (1962).
2. Design and Review of Structures for Protection from Fallout Gamma Radiation, Office of Civil and Defense Mobilization, Oct. 1, 1961.
3. U. Fano, L. V. Spencer, and M. J. Berger in: Encyclopedia of Physics, ed. by S. FLÜGge, Vol. Xxxviii/2, Berlin/Göttingen/Heidelberg: Springer 1959, pp. 660–817.
4. U. Fano, C. D. Zerby, and M. J. Berger: Chapter 10 In: “Reactor Handbook”, 2nd Ed., Vol. Iii, Part B “Shielding”, ed. by E. P. Blizard and L. S. Abbott, New York: Interscience Publishers 1962.
5. H. Goldstein and J. E. Wilkins: Nyo-3075 (1954).