1. Sobolev Spaces;Adams,1975
2. Some compact embedding theorems for weighted Sobolev spaces;Benci;Boll. Un. Mat. Ital.,1976
3. V. Benci andD. Fortunato, Weighted Sobolev spaces and the nonlinear Dirichlet problem in unbounded domains, Ann. Mat. Pura Appl. to appear.
4. Second order elliptic operators on unbounded domains;Benci;Boll. Un. Mat.,1978
5. Discreteness conditions of the spectrum of Schro¨dinger operators;Benci;J. Math. Anal. Appl.,1978