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2. A REDUCE package for determining Lie symmetries of ordinary and partial differential equations;Schwarz;Comput. Phys. Comm.,1982
3. A MACSYMA program for Calculating the Symmetry Group of a System of Differential Equations;Champagne,1985
4. Introduction to Lie Algebras and Representation Theory;Humphreys,1972
5. Differential Geometry, Lie Groups and Symmetric Spaces;Helgason,1978