Rotationally invariant periodic solutions of semilinear wave equations.
Semilinear problems with bounded nonlinear term.
Periodic solutions of second-order nonautonomous dynamical systems.
The use of Cerami sequences in critical point theory.
Semilinear elliptic equations having asymptotic limits at zero and infinity.
Finding linking sets.
Asymptotically Linear Elliptic Boundary Value Problems.
Wave operators for pairs of spaces and the Klein-Gordon equation.
Superlinear Elliptic Boundary Value Problems.
Wave operators for pairs of spaces and the Klein-Gordon equation. (Short Communication).
Elliptic resonance problems with unequal limits at infinity.
On Lp Estimates and Regularity II.
Scattering Theory for Elliptic Operators of Arbitrary Order
The invariance principle.
New linking theorems
Complex interpolation
A generalization of the saddle point method with applications
We show that one can drop an important hypothesis of the saddle point theorem without affecting the result. We then show how this leads to stronger results in applications.
Completeness of wave operators in two Hilbert spaces
On the dominance of partial differential operators II
A generalization of the problem of transmission
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