1. L Boltzmann, Vorlesungen über Gastheorie, Leipzig, JA Barth, 1896.
2. D Hawkins and S Ulam, MDDC 287 (1944), CJ Everett and S Ulam, LADC-533-534: LA-683, LA-690, and LA-707 (1948). F r a very brief summary, see F. de Hoffmann, The science and engineering of nuclear power, New York, Addison-Wesley Press, 1949, vol. 2, pp. 116–119. Also RP Feynman, F de Hoffmann and R Serber, J Nucl. En. vol. 3 (1956) p. 64: and LD Pal, Paper 1710, Second United Nations Conference on the Peaceful Uses of Atomic Energy, 1958 (“Second Geneva Conference ”)
3. S Borowitz and M Hamermesh, Phys. Rev. vol. 74 (1948) p. 1285.
4. See in particular CC Grosjean, Nuovo Cim. vol. 3 (1956) p. 1262 and Papers 1691-1692 of the Second Geneva Conference, 1958. See also E. P. Wigner, Phys. Rev. vol. 94 (1954) p. 17.
5. AM Weinberg and EP Wigner, The physical theory of neutron chain reactors, Chicago, University of Chicago Press, 1958, p. 406ff.