1. D. J. HUGHES, “Pile Neutron Research”, Addison-Wesley, Reading, Massachusetts, 1953.
2. See S. GLASSTONE, “Principles of Nuclear Reactor Engineering,” p. 111. Van Nostrand, Princeton, New Jersey, 1955.
3. M. J. POOLE, M. S. NELKIN, and R. S. STONE, “Progress in Nuclear Energy. Series I. Physics and Mathematics” (ed. by D. J. HUGHES, J. E. SANDERS, and J. HOROWITZ), Vol. 2, Chap. 3. Pergamon, London, 1958.
4. See J. A. HARVEY AND J. E. SANDERS, “Progress in Nuclear Energy. I. Mathematics and Physics” (ed by R. A. CHARPIE, J. HOROWITZ, D. HUGHES, and D. J. LITTLER) chap. 1, p. 45. Pergamon, London, 1956.