1. F. Girardi, R. Pietra, E. Sabbioni,J. Radioanal. Chem., 5 /1970/ 141.
2. C.B. Amphlett, L.A. McDonald, J.S. Burgess, J.A. Maynard,J. Inorg. Nucl. Chem., 10 /1959/ 69.
3. I.J. Gal, O.S. Gal, Proc. U.N. Intern. Conf. Peaceful Uses of Atomic Energy, Geneva, 28, 24, 1958.
4. I.I.L. Cunha, L.G. Andrade e Silva, XVI Congresso Latino-Americano de Quimica, Rio de Janeiro, Brasil, 1984.
5. I.I.L. Cunha, L.G. Andrade e Silva, I Congresso Geral de Energia Nuclear, Rio de Janeiro, Brasil, 1986.