1. NBS Handbook 85, USA (1964).
2. M. F. Yudin and V. I. Fominykh, Neutron Dosimetry [in Russian], Standartgiz, Moscow (1964).
3. L. Medvetski, At. Énerg.,13, 583 (1962).
4. K. Geiger et al., Canad. J. Phys.,42, 1097 (1964).
5. J. Marion and T. Bonner, Fast Neutron Physics [Russian translation], Vol. 2. Atomizdat, Moscow (1966), p. 614.