1. A.L. Yakubovich, Yaderno-fizicheskiye metody analiza mineralnogo syriya, Atomizdat, Moscow, 1982.
2. L.F. Borisenko, S.Ya. Lyapunov,Dokl. Akad. Nauk SSSR, 260 /1981/ 717.
3. P.A. Vaganov, Neutronoaktivatsionnye issledovaniya geokhimicheskikh assotsiatsii redkikh zemel, Energoizdat, Moscow, 1981.
4. J. Ishimori, E. Nakamura, Jap. Atom. Energy Comm. Report, JAEPI-1047, 1963.
5. E. Cerrai, C. Testa,Energia Nucleare, 8 /1961/ 510.