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2. Singularities of Caustics and Wave Fronts;Arnol'd,1991
3. Indices of singular points of 1-forms on a manifold with boundary, the convolution of invariants of groups generated by reflections, and the singular projections of smooth surfaces;Arnol'd;Uspekhi Mat. Nauk,1979
4. Dynamical Systems, vol. VIII;Arnol'd,1988