  We study the radiative decay Z-->neutrino antineutrino gamma whitin an
effective Lagrangian approach. Using the search for energetic single-photon
events in the data collected by the L3 collaboration, we get direct bounds on
the dimension-six and the dimension-eight operators associated with the
tau-neutrino magnetic moment and the anomalous electromagnetic properties of
the Z boson. As a by-product of our calculation, we reproduce the L3 result for
the bound on the tau-neutrino magnetic moment.
