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.,5, No. 4, 3–25 (1972).
2. V. I. Arnol'd, "Critical points of functions on manifolds with boundary, simple Lie groups Bk, Ck, F4, and singularities of evolutes," Usp. Mat. Fiz.,33, No. 5, 91–105 (1978).
3. V. I. Arnol'd, A. N. Varchenko, and S. M. Gusein-Zade, Singularities of Differentiable Maps [in Russian], Vol. 1, Nauka, Moscow (1982).
4. V. I. Arnol'd, A. N. Varchenko, and S. M. Gusein-Zade, Singularities of Differentiable Maps [in Russian], Vol. 2, Nauka, Moscow (1984).
5. I. N. Bernshtein, "Analytic continuation of generalized functions with respect to a parameter," Funkts. Anal. Prilozhen.,6, No. 4, 26–40 (1972).