1. K. M. CASE, F. DE HOFFMANN, and G. PLACZEK, “Introduction to the Theory of Neutron Diffusion,” Vol. I. U. S. Government Printing Office, Washington, D. C. (1953).
2. S. GLASSTONE and M. C. EDLTJND, “The Elements of Nuclear Reactor Theory,” Van Nostrand, New York (1952).