1. Zampieri G., Finding domains of invertibility for smooth functions by means of attraction basins, J. diff. Eqns (to appear).
2. Nonlinearity and Functional Analysis;Berger,1977
3. Nonlinear Functional Analysis;Deimling,1985
4. Analisi non lineare;Prodi,1973
5. Locally one-to-one mappings and a classical theorem on schlicht functions;Meisters;Duke math. J.,1963