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Contrary to the general belief, there has recently been quite a few examplesof unitary evolution of quantum cosmological models. The present work givesmore examples, namely Bianchi type VI and type II. These examples are importantas they involve varying spatial curvature unlike the most talked abouthomogeneous but anisotropic cosmological models like Bianchi I, V and IX. Weexhibit either explicit example of the unitary solutions of the Wheeler-DeWittequation, or at least show that a self-adjoint extension is possible.

Unitary evolution for anisotropic quantum cosmologies: models with variable spatial curvature