- J. de Kleine, M. B. Monagan and A. D. Wittkopf,
*Algorithms for the Non-monic case of the Sparse Modular GCD Algorithm*, Submitted to 2005 International Symposium on Symbolic and Algebraic Computation (ISSAC). - G. J. Reid, J. Verschelde, A. D. Wittkopf and W. Wu,
*Symbolic-Numeric Completion of Differential Systems by Homotopy Continuation*, Submitted to 2005 International Symposium on Symbolic and Algebraic Computation (ISSAC).

- K. Hazaveh, D.J. Jeffrey, G.J. Reid, S.M. Watt and A.D. Wittkopf
(2003),
*An exploration of homotopy solving in Maple*, Proc. of the Sixth Asian Symp. on Computer Math. (ASCM). Lect. Notes Series on Computing by World Sci. Publ. 10, edited by Z. Li and W. Sit (Singapore/River Edge, USA) 145-162. - A. D. Wittkopf and G. J. Reid,
*Fast Differential Elimination in C: The CDiffElim Environment*, Computer Physics Communications (2001)**139**192-217.

http://wayback.cecm.sfu.ca/~wittkopf/files/DiffElim.ps.gz - G. J. Reid, P. Lin, and A. D. Wittkopf,
*Differential-Elimination Completion Algorithms for DAE and PDAE*, Studies in Applied Mathematics (2001)**106(1)**1-45.

http://wayback.cecm.sfu.ca/~wittkopf/files/ReidLinWittkopf96.ps.gz - G.J. Reid and A.D. Wittkopf (2000),
*Determination of Maximal Symmetry Groups of Classes of Differential Equations*, in Proceedings of the 2000 International Symposium on Symbolic and Algebraic Computation (ISSAC), edited by C. Traverso, 272-280 (ACM Press, New York). - M.B. Monagan and A.D. Wittkopf (2000),
*On the Design and Implementation of Brown's Algorithm over the Integers and Number Fields*in Proceedings of the 2000 International Symposium on Symbolic and Algebraic Computation (ISSAC), edited by C. Traverso, 225-233 (ACM Press, New York). - C.J. Rust, G.J. Reid and A.D. Wittkopf (1999),
*Existence and Uniqueness Theorems for Formal Power Series Solutions of Analytic Differential Systems*, in Proceedings of the 1999 International Symposium on Symbolic and Algebraic Computation (ISSAC), edited by S. Dooley 105-112 (ACM Press, New York). - G. J. Reid, A. D. Wittkopf and A. Boulton (1996),
*Reduction of systems of nonlinear partial differential equations to simplified involutive forms*. Eur. J. of Appl. Math. (1996)**7**604 - 635.

http://wayback.cecm.sfu.ca/~wittkopf/files/iam94-14.ps.gz - G. J. Reid, D. T. Weih and A. D. Wittkopf (1993),
*A point symmetry group of a differential equation which can not be found using infinitesimal methods*, in Modern Group Analysis: Advanced Analytical and Computational Methods in Mathematical Physics, edited by N.H. Ibragimov, M. Torrisi and A. Valenti, (1993) 311-316 (Kluwer Academic Publishers, Amsterdam). - G. J. Reid, I. G. Lisle, A. Boulton and A. D. Wittkopf (1992),
*Algorithmic determination of commutation relations for Lie symmetry algebras of PDEs*, in Proceedings of the 1992 International Symposium on Symbolic and Algebraic Computation (ISSAC), edited by P. S. Wang, 63-68 (ACM Press, New York).

- A. D. Wittkopf (2004),
*Algorithms and Implementations for Differential Elimination*. PhD. Thesis, Simon Fraser University, Burnaby, British Columbia, Canada. Advisors: Dr. Michael Monagan, Dr. G. J. Reid

http://wayback.cecm.sfu.ca/~wittkopf/files/phdthesis.ps.gz - A. D. Wittkopf and G. J. Reid,
*Fast Differential Elimination Algorithms*, Technical Report TR-00-06 at the Ontario Research Centre for Computer Algebra (2000).

http://wayback.cecm.sfu.ca/~wittkopf/files/WittkopfReid99.ps.gz - A. D. Wittkopf (1994),
*High Order Wide and Compact Schemes for the Steady Incompressible Navier-Stokes Equations*. MSc. Thesis, Simon Fraser University, Burnaby, British Columbia, Canada. Advisor: Dr. Tao Tang http://wayback.cecm.sfu.ca/~wittkopf/files/mscthesis.ps.gz - G. J. Reid and A. D. Wittkopf (1993),
*Long Guide to the Standard Form Package*. This 90 page manual gives a detailed guide to the use of our programs. Programs and manual are available at

http://wayback.cecm.sfu.ca/~wittkopf/standardform.html.