  By using a relativistic framework and accurate nuclear spectral functions we
evaluate the ratio F_{3A}/AF_{3N} of deep inelastic neutrino scattering.
Parametrizations of this ratio for different values of Q^2 are provided. These
results should be useful for taking into account the nuclear effects in
analyses of experimental data in neutrino reactions in nuclear targets, and
test QCD predictions for the nucleon structure functions. In particular, the
size of the nuclear corrections is of the same order of magnitude as the size
of the QCD corrections to the Gross-Llewellyn Smith sum rule.
