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2. Yu. S. Il'yashenko: Remarks on the topology of singular points of analytic differential equations in the complex domain and Ladis' theorem, Funct. Analysis and its Applications vol. 11, No 2 (1977), p. 105–113.
3. M. Hirsch, C. Pugh and M. Shub: Invariant manifolds, Lecture Notes in Math., Springer-Verlag, 583 (1977).
4. N. Kuiper: Cr functions near non-degenerate critical points, preprint Univ. of Warwick.
5. W. de Melo: Moduli of stability of two-dimensional diffeomorphisms, to appear in Topology.