1. D.A. Shirley, inHyperfine Structure and Naclear Radiations, edited by E. Matthias and D.A. Shirley (Amsterdam, North-Holland 1968) p. 979
2. T.A. Koster and D.A. Shirley, inHyperfine. Interaction in Excited Nuclei, edited by G. Goldring and R. Kalish (New York, Gordon and Breach, 1971) p. 1239
3. G.N. Rao, Hyperfine Interactions 7 (1979) 141