1. Differential Equations. Their Solutions Using Symmetries;Stephani,1989
2. Symmetries and Differential Equations;Bluman,1989
3. Applications of Lie Groups to Differential Equations;Olver,1993
4. Classification and Identification of Lie Algebras;Snobl,2014
5. Classical Lie symmetries and reductions for a generalized NLS equation in 2+1 dimensions