1. Thompson, W. S., Lewis, D. T.: Population Problems. New York: McGraw Hill 1965;
2. Putnam, P. C.: Energy in the Future. New York: Van Nostrand 1953
3. U.N. World Population Conference called for 1974 by ECOSOC Resolution 1484 (48), 1972
4. Lewis, W. B.: How much of the rocks and the oceans for power? Exploiting the Uranium-Thorium Fission Cycle. AECL-1916, April 1964; b Lewis, W. B., Church, T. G.: AECL-2001; Paper P/1, Vol. 1, p. 53. Proc. 3rd U.N. Int. Conf. Peaceful Uses of Atomic Energy, Geneva, Sept. 1964
5. Weinberg, A. M., Hammond, R. P.: Paper P/033, Vol. 1, p. 171, Proc. 4th U.N. Int. Conf. Peaceful Uses of Atomic Energy, Geneva, Sept. 1971