  Inhomogeneous multidimensional cosmological models with a higher dimensional
space-time manifold M=M_0 x M_1 x ... M_n are investigated under dimensional
reduction to tensor-multi-scalar theories. In the Einstein conformal frame,
these theories take the shape of a flat sigma-model. For the singular case
where M_0 is 2-dimensional, the dimensional reduction to dilaton gravity is
preformed with different distinguished representations of the action.
