We show that alpha < 0, beta > 0, gamma=delta=0 Painleve III equation arise
s as a zero-curvature condition in the Belinskii-Zakharov inverse scatterin
g formulation for Bianchi cosmological models. For special values of the pa
rameters this Painleve III equation becomes the dynamical equation for Bian
chi I, II, VI0, and VII0 models. (C) 2000 American Institute of Physics. [S
0022-2488(00)04207-9].