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- Ravil Yamilov, “Symmetries as integrability criteria for differential difference equations”, J. Phys. A: Math. Gen., 39, № 45, 2006, R541
- S. Y. Lou, C. Rogers, W. K. Schief, “On a Nonlinear Discretized LKR System: Reductions and Underlying Virasoro Symmetry Algebras”, Stud Appl Math, 113, № 4, 2004, 353
- D Levi, A M Grundland, “Discrete third-order spectral problems and a new Toda-type equation”, J. Phys. A: Math. Gen., 35, № 6, 2002, L67
- D Levi, P Winternitz, “Lie point symmetries and commuting flows for equations on lattices”, J. Phys. A: Math. Gen., 35, № 9, 2002, 2249
- Decio Levi, Pavel Winternitz, “Continuous symmetries of difference equations”, J. Phys. A: Math. Gen., 39, № 2, 2006, R1