1. Gerdau, E., Scharnberg, B., Winkler, H.: In: Hyperfine interactions in excited nuclei, ed. by Goldring, G. and Kalish, R., p. 681. New York: Gordon & Breach 1971
2. Lederer, C. M., Hollander, J. M., Perlman, L.: Table of isotopes. New York: John Wiley & Son 1967
3. Frauenfelder, H., Steffen, R. M.: In: Alpha-, beta-, and gamma-ray spectroscopy, ed. by Siegbahn, K., p. 997. Amsterdam: North Holland 1965
4. Matthias, E., Karlsson, E., Svensson, A. G., Johansson, K., Andrade, P. da R.: In: Perturbed angular correlations, ed. by Karlsson, E. and Matthias, E., p. 257 Amsterdam: North Holland 1964
5. Andrade, P. da R., Vasquez, A., Rogers, J. D., Fraga, E. R.: Phys. Rev. B1, 2912 (1970)