  We study higher-order corrections to the Grimus-Stockinger theorem dealing
with the large-distance asymptotic behavior of the wave-packet modified
neutrino propagator within the framework of field-theoretical description of
the neutrino oscillation phenomenon. We discuss the possibility that these
corrections are responsible for breakdown of the classical inverse-square law
(ISL) at the macroscopic distances. In particular the ISL violation can be an
explanation of the well-known reactor antineutrino anomaly.
