Allan D. Wittkopf

Determination of maximal symmetry groups of classes of differential equations

Gregory J. Reid, Allan D. Wittkopf, G. Reid, 2000, ISSAC.

Algorithmic determination of commutation relations for Lie symmetry algebras of PDEs

Gregory J. Reid, Ian G. Lisle, Allan D. Wittkopf, 1992, ISSAC '92.

Algorithms for the non-monic case of the sparse modular GCD algorithm

Michael B. Monagan, Allan D. Wittkopf, Jennifer de Kleine, 2005, ISSAC.

Existence and uniqueness theorems for formal power series solutions of analytic differential systems

Gregory J. Reid, Allan D. Wittkopf, C. J. Rust, 1999, ISSAC '99.

On the design and implementation of Brown's algorithm over the integers and number fields

Michael B. Monagan, Allan D. Wittkopf, 2000, ISSAC.

Symbolic-numeric completion of differential systems by homotopy continuation

Wenyuan Wu, Gregory J. Reid, Jan Verschelde, 2005, ISSAC.

Reduction of systems of nonlinear partial differential equations to simplified involutive forms

Gregory J. Reid, Allan D. Wittkopf, G. Reid, 1996, European Journal of Applied Mathematics.