Are Neutrino Oscillations a Non-stationary Phenomenon?

We discuss different schemes of neutrino oscillations and the time-energy uncertainty relation. From the results of the K2K and MINOS accelerator experiments follows that neutrino oscillations are a non-stationary phenomenon and that the standard time-energy uncertainty relation is satisfied. Are these properties a general feature of neutrino oscillations? In this paper we demonstrate that a recently proposed tritium/helium-3 Moessbauer neutrino-experiment could answer this question.