Journal of Mathematical Sciences · 2006 · 19 citations · 3 references
Natural SciencesMathematicsPhysicsDifferential EquationsMathematical PhysicsCanonical TransformationsHyperbolic GeometryIntegral Equation FormulationsIntegral EquationsPartial Differential EquationsSystems Of Differential EquationsHyperbolic Partial Differential EquationsSymmetriesSymmetry Reductions
3
On the Existence of Global Variational Principles
Ian Anderson, T. Duchamp · American Journal of Mathematics · 1980 · 183 citations
Higher symmetries of two-dimensional lattices
A. B. Shabat · Physics Letters A · 1995 · 38 citations