1. Sobolev Spaces;Adams,1975
2. Unstable invariant sets of semigroups of nonlinear operators and their perturbations;Babin;Russian Math. Surveys,1986
3. P. Bates and C. K. R. T. Jones, The center manifold theorem with applications, preprint.
4. Application of Center Manifold Theory;Carr,1981
5. Methods of Bifurcation Theory;Chow,1982