1. H. Amann, E. Zehnder, Nontrivial solutions for a class of nonresonance problems and applications to nonlinear differential equations, Ann. Sc. Norm. Super. Pisa Cl. Sci. 7(1980), No. 4, 539--603.
2. Ordinary Differential Equations
3. V. I. Arnold, Ordinary differential equations, Springer-Verlag, Berlin, 1992.
4. A third-order differential equation arising in thin-film flows and relevant to Tanner's Law
5. M. Frigon, H. Gilbert, Existence theorems for systems of third order differential equations, Dynam. Systems Appl. 19(2010), No. 1, 1--23.