1. Cook jr, G.O.: Development of a Magnetohydrodynamic Code for Axisymmetric, High-beta Plasmas with Complex Magnetic Fields, Lawrence Livermore Nat.Lab. Report No UCRL-53324 (1982).
2. Hearn, A.C.: The Problem of Substitution, Proceedings IBM Summer Institute on Symb.Math. by Computer, IBM Programming Lab. Report No. FSC-69-0312 (1969).
3. Hearn, A.C.: Structure: The Key to Improved Algebraic Computation, Proceedings RSYMSAC, Wako-shi, Saitama, Japan (1984).
4. Hulshof, B.J.A., van Hulzen, J.A.: An Expression Compression Package for REDUCE (in preparation).
5. The MATHLAB group: MACSYMA Reference Manual, version ten, V2-4, Cambridge: MIT (1983).