1. V. Ya. Pupko, in: Theoretical and Experimental Problems in Nonstationary Neutron Transport [in Russian], Atomizdat, Moscow (1972), p. 66.
2. E. Pendlebury, Proc. Phys. Soc.,68A, 474 (1955).
3. S. B. Shikhov and A. A. Shkurpelov, cf. [1],, p. 97.
4. G. I. Marchuk, Methods of Making Nuclear Reactor Calculations [in Russian], Gosatomizdat, Moscow (1961).
5. L. N. Uzachev, Atomnaya Énergiya,15, 472 (1963).