  The isoscalar structure functions $xF_3$ and $F_2$ are measured as functions
of $x$ averaged over all $Q^2$ permissible for the range of 6 to 28 GeV of
incident neutrino (anti-neutrino) energy at the IHEP-JINR Neutrino Detector.
The QCD analysis of $xF_3$ structure function provides
$\Lambda_{\bar{MS}}^{(4)} = (411 \pm 200)$ MeV under the assumption of QCD
validity in the region of low $Q^2$. The corresponding value of the strong
interaction constant $\alpha_S (M_Z) = 0.123^{+0.010}_{-0.013}$ agrees with the
recent result of the CCFR collaboration and with the combined LEP/SLC result.
