[1] Reines, F., Jr., Cowan, C. L.: Free Antineutrino Absorption Cross Section. I. Measurement of the Free Antineutrino Cross Section on Protons. Phys. Rev. 113 (1959), 273.
[2] Perl, M. L.: Evidence for anomalous lepton production in $e^{+}e^{-}$ annihilation. Phys. Rev. Lett. 35 (1975), 1489.