1. Amann, H., Zehnder, E.: Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations. Ann. Scuola Norm. Sup. Pisa Cl. Sci. 7, 539–603 (1980)
2. Amann, H.: Saddle points and multiple solutions of differential equations. Math. Z. 169, 127–166 (1979)
3. Applied Mathematical Sciences;VI Arnold,1998
4. Bardi, M., Capuzzo-Dolcetta, I.: Optimal Control and Viscosity Solutions of Hamilton-Jacobi-Bellman Equations. Birkhäuser Boston Inc, Boston, MA (1997)
5. Bertini, L., De Sole, A., Gabrielli, D., Jona-Lasinio, G., Landim, C.: Macroscopic Fluctuation Theory (2014). arXiv:1404.6466