On the extra factor of two in the phase of neutrino oscillations
  Attempts to modify the standard expression for the phase in neutrino oscillations by an extra factor of two are based on misuse of quantum mechanics. Claims to present Bruno Pontecorvo and his coauthors as ``godfathers'' of this ``extra 2'' factor are easily disproved by unbiased reading their articles. 
L.B. Okun, M.G. Schepkin, I.S. Tsukerman