1. The general similarity solution of the heat equation;Bluman;J. Math. Mech.,1969
2. Symmetries and Differential Equaions;Bluman,1989
3. On travelling wave solutions of Fisher’s equation in two spatial dimensions;Brazhnik;SIAM J. Appl. Math.,1999
4. Introduction to Symmetry Analysis;Cantwell,2002
5. An exact solution for travelling waves of ut=Duxx+u−uk;Kaliappan;Physica D,1984