1. V. I. Arnol'd, ?Normal forms of functions near degenerate critical points, the Weyl groups Ak, Dk, Ek, and Lagrangian singularities,? Funkts. Anal. Prilozhen.,6, No. 4, 3?25 (1972).
2. V. I. Arnol'd, Mathematical Methods of Classical Mechanics [in Russian], Nauka, Moscow (1974).
3. V. I. Arnol'd, ?Critical points of functions on a manifold with boundary, the simple Lie groups Bk, Ck, Fk, and singularities of evolutes,? Usp. Mat. Nauk,33, No. 5, 91?105 (1978).
4. V. I. Arnol'd, ?Indices of singular points of 1-forms on a manifold with boundary, displacement of invariants of groups generated by reflections, and singular projections of smooth surfaces,? Usp. Mat. Nauk,34, No. 2, 3?38 (1979).
5. V. I. Arnol'd, ?Spectral sequences for reducing functions to normal forms,? in: Problems of Mechanics and Mathematical Physics [in Russian], Nauka, Moscow (1976), pp. 7?20.