1. R. D. Evans, The atomic nucleus, McGraw-Hill Company (1955)
2. M. Deutsch e O. Kofoed-Hansen, Beta-rays, in E. Segrè, Experimental nuclear physics, vol. III, p. 426, John Wiley (1959)
3. L. I. Shiff, Quantum mechanics, McGraw-Hill (1968)
4. M. G. Bowler, Nuclear Physics, Pergamom Press (1973)
5. E. Segrè, Nuclei e particelle, Zanichelli (1982)