1. I. Ya. Emel'yanov, P. A. Gavrilov, and B. N. Seliverstov, Control and Safety in Nuclear Power Reactors [in Russian], Atomizdat, Moscow (1975).
2. A. Hitchcock, Nuclear Reactor Stability [Russian translation], Gosatomizdat, Moscow (1963).
3. D. Wiberg, Nucl. Sci. Eng.,27, 600 (1967).
4. I. S. Postnikov and E. F. Sabaev, At. Energ.,26, No. 1, 56 (1969).
5. I. Ya. Emel'yanov et al., At. Energ.,46, No. 2, 82 (1979).