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[1] P. BARTOLO V. BENCI D. FORTUNATO: Abstract critical point theorems and applications to some nonlinear problems with "strong resonance" at infinity. to appear. MR 0713209
[2] V. BENCI: A geometrical index for the group $S^1$ and some applications to the research of periodic solutions of O.D.E. 'S. to appear. Zbl 0447.34040
[3] G. CERAMI: Un criterio di esistenza per i punti critici su varietà illimitate. Rendiconti dell' Academia di Sc. e Lett, dell' Istituto Lombardo 112 (1978), 332-336. Zbl 0436.58006
[4] T. KATO: Perturbation theory for linear operators. Springer-Verlag, New York, 1966. MR 0203473 | Zbl 0148.12601
[5] K. THEWS: $T$-periodic solutions of time dependent Hamiltonian systems with a potential vanishing at infinity. to appear. MR 0612616 | Zbl 0467.35009
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