Singular separatrix splitting and the Melnikov method: An experimental study. Delshams, Amadeu, Ramírez-Ros, Rafael (1999) Experimental Mathematics
Symmetric three-term recurrence equations and their symplectic structure. Šimon Hilscher, Roman, Zeidan, Vera (2010) Advances in Difference Equations [electronic only]
Symplectic difference systems: oscillation theory and hyperbolic Prüfer transformation. Došlý, Ondřej (2004) Abstract and Applied Analysis
Systèmes bihamiltoniens en dimension impaire Marie-Hélène Rigal (1998) Annales scientifiques de l'École Normale Supérieure