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I'm dissatisfied with the "proofs" I've found so far. E.g., in Kayser's review from 2008, in the paragraph following his eq(1.4), he assumes a propagation amplitude Prop##(\nu_i)## of ##\exp(-im_i \tau_i)##, where "##m_i## is the mass of the ##\nu_i## and ##\tau_i## is the proper time that elapses in the ##\nu_i## rest frame during its propagation". I.e., he assumes ##m_i \ne 0##. Thus, he proves only that nonzero neutrino masses imply neutrino flavor oscillation, but

**not**the converse, afaict.

Can anyone point me to better references, pls?