1. Benci, V.: A new approach to the Morse-Conley theory and applications. Ann. Mat. Pura Appl.158, 231?305 (1991)
2. Benci, V.: Introduction to Morse theory. A new approach, (to appear)
3. Benci, V., Cerami, G.: The effect of the domain topology on the number of positive solutions of nonlinear elliptic problems, Arch. Ration. Mech. Anal.114, 79?93 (1991)
4. Benci, V., Cerami, G., Passaseo, D.: On the number of the positive solutions of some nonlinear elliptic problems. In: Nonlinear analisys. A tribute in honour of G. Prodi. Quaderno Scuola Normale Superiore, Pisa, 1991, pp. 93?109
5. Benci, V., Giannoni, F.: In preparation.