1. Applications of Lie Groups to Differential Equations;Olver,1988
2. MACSYMA Reference Manual, Version 13, Computer Aided Mathematics Group,1989
3. MACSYMA User's Guide, Computer Aided Mathematics Group,1988
4. Nonlinear Partial Differential Equations in Engineering;Ames,1972
5. Similarity Methods for Differential Equations;Bluman,1974