1. Konopinski, E.J.: The theory of beta radioactivity. Oxford: Clarendon 1966
2. Schopper, H.F.: Weak interactions and nuclear beta decay. Amsterdam: North Holland 1966
3. Wu, C.S., Moszkowski, S.A.: Beta decay. New York: Wiley 1966
4. Bohr, A., Mottelson, B.R.: Nuclear structure, Vol. 1. New York: Benjamin 1969
5. Morita, M.: Beta decay and muon capture. Massachusetts: Benjamin 1973