1. Group Analysis of Differential Equations;Ovsiannikov,1982
2. Applications of Lie Groups to Differential Equations;Olver,1986
3. CRC Handbook of Lie Group Analysis of Differential Equations (Volume 3),1996
4. Symmetry Analysis of Differential Equations with Mathematica;Baumann,2000
5. Symmetry and Integration Methods for Differential Equations;Bluman,2002