  We show that \a < 0, \b > 0, \g=\d=0 Painleve III equation arises as a
zero-curvature condition in the Belinskii-Zakharov inverse-scattering
formulation for Bianchi cosmological models. For special values of the
parameters this Painleve III equation becomes the dynamical equation for
Bianchi I, II, VI_0 and VII_0 models.
