1. D. Schiff, Quantum Mechanics [Russian translation], IL, Moscow (1957).
2. B. Davison, Theory of Neutron Transport [Russian translation], Atomizdat, Moscow (1960).
3. N. Corngold, Proc. Phys. Soc.,A70, 793 (1957).
4. A. Weinberg and E. Wigner, Physical Theory of Nuclear Reactors [Russian translation], IL, Moscow (1961).
5. N. I. Laletin, Preprint IAÉ-2146 (1971).