1. Optimal Control of Systems Governed by Partial Differential Equations;Lions,1971
2. Schröinger Equations and Diffusion Theory;Nagasawa,1993
3. Characterization of the ranges of some nonlinear operators and applications to boundary value problems;Brézis;Ann. Sc. Norm. Super. Pisa,1978
4. Homoclinic orbits for a class of infinite dimensional Hamiltonian systems;Clément;Ann. Sc. Norm. Super. Pisa,1997
5. Strongly indefinite functions and multiple solutions of elliptic systems;De Figueiredo;Trans. Amer. Math. Soc.,2003