  The isoscalar structure functions xF_3 and F_2 are measured as functions of x
averaged over all Q^2 permissible for the range 6 to 28 GeV of incident
(anti)neutrino energy. With the measured values of xF_3, the value of the
Gross-Llewellyn Smith sum rule is found to be $\int_{0}^{1}{F_3 dx} =
2.13\pm0.38 (stat)\pm 0.26 (syst)$. The QCD analysis of xF_3 provides
$\Lambda_{\overline{MS}} =358 \pm 59 MeV$ . The obtained value of the strong
interaction constant $\alpha_S (M_Z)=0.120^{+3}_{-4}$ is larger than most of
the deep inelastic scattering results.
