1. R. L. Ashley and W. E. Kreger, (editors), “Neutron Attenuation in Optically Thick Shields”, ANS-SD-1, American Nuclear Society, Hinsdale, III. (1964).
2. E. Aalto and R. Nilsson, “Measurements of Neutron and Gamma Attenuation in Massive Laminated Shields of Concrete and a Study of the Accuracy of some Methods of Calculation”, AE-157, AB Atomenergi, Stockholm, Sweden (1964).
3. H. Goldstein, Fundamental Aspects of Reactor Shielding, p 118, Addison-Wesley Publishing Co., Reading, Mass. (1959).
4. A. F. Avery, D. E. Bendall, J. Butler, and K. T. Spinney, “Methods of Calculation for Use in the Design of Shields for Power Reactors”, AERE-R 3216, Atomic Energy Research Establishment, Harwell, England (1960).
5. L. HjÄRne (editor), “User’s Manual for the NRN Shield Design Method”, AE-145, AB Atomenergi, Stockholm, Sweden (1964).