1. Enns, F., Phys. Rev., 1939, vol. 55, no.4, p. 118.
2. Pool, M.L., Thompson, S.J., and Cork, J.M., Phys. Rev., 1937, vol. 51, no.1, p. 890.
3. Allison, J.R. and Smith, W.G., Phys. Rev., 1938, vol. 53, no.3, p. 946.
4. Zakharova, L.V., Popov, Yu.S., Andreev, O.I., et al., Abstracts of Papers, Molodezhnaya rossiiskaya konferentsiya po fundamental’nym problemam yadernoi fiziki i energetiki (Russian Conference of Young Scientists on Basic Problems of Nuclear Physics and Power Engineering), Nizhni Novgorod, November 15, 2002, pp. 46–47.
5. Gum, J.R., Thompson, S.J., and Pool, M.L., Phys. Rev., 1949, vol. 76, no.1, p. 184.