Symmetries of linear ordinary differential equations.

Symmetries and First Integrals of Ordinary Difference Equations

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Symmetries and infinitesimal symmetries of singular differential equations

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Lie theory of differential equations and computer algebra (1991).

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Classification of second-order ordinary differential equations admitting Lie groups of fiber-preserving symmetries (1989)

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C∞−symmetries and reduction of equations without lie point symmetries.

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Reductive inear differential algebraic groups and the galois groups of parameterized linear differential equations (2013).

Galois theory of parameterized differential equations and linear differential algebraic groups (2006)

Four Dimensional Lie Symmetry Algebras and Fourth Order Ordinary Differential Equations (2002)