  We analyse recent experimental data on the GSI oscillations of the
hydrogen-like heavy {^{142}}{\rm Pm}^{60+} ions that is a time modulation of
the K-shell electron capture (EC) decay rate. We follow the mechanism of the
GSI oscillations, caused by an interference of the neutrino flavour
mass-eigenstates in a content of the electron neutrino. We give arguments that
these experimental data show i) an existence of sterile neutrinos that is
necessary for an explanation of a phase-shift, ii) an observation of CP
violation, related to a phase-shift, and iii) an influence of the Quantum Zeno
Effect, explaining different values of the amplitude and phase-shift for two
runs of measurements with different time resolutions and different numbers of
consecutive measurements.
