1. A. Lightman, The Discoveries: Great Breakthroughs in Twentieth-Century Science, Including the Original Papers (Alfred A. Knopf, Toronto, 2005), p. 8
2. C.D. Ellis, W.A. Wooster, The continuous spectrum of β-rays. Nature 119, 563 (1927)
3. C. Sutton, Spaceship Neutrino (Cambridge University Press, Cambridge, 1992) (As quoted by F. Reines in the Foreword)
4. E. Fermi, Versuch einer theorie der β-strahlen. Z. Phys. 88, 161 (1934)
5. E. Fermi, tentativo di una teoria dei raggi β. Nuovo Cimento 11, 1 (1934)