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 1. Symmetries, Exact Solutions, and Conservation Laws,1994
4. CRC Handbook of Lie Group Analysis of Differential Equations, Volume 2. Applications in Engineering and Physical Sciences,1995
5. CRC Handbook of Lie Group Analysis of Differential Equations, Volume 3. New Trends in Theoretical Developments and Computational Methods,1996