1. R. Avery, in: Transactions of the Second Geneva Conference, Selected Reports by Scientists from Abroad [Russian translation], Vol. 3, Atomizdat, Moscow (1958), p. 321.
2. H. Plaza and W. Kohler, Nucl. Sci. Eng.,26, No. 3, 419 (1966).
3. A. Belleni-Morante, Nucleonik,10, No. 4, 217 (1967).
4. D. L. Hetrick, Dynamics of Nuclear Reactors, Univ. of Chicago Press (1971).
5. C. Cohn, Nucl. Sci. Eng.,13, No. 1, 12 (1962).