1. A connection between nonlinear evolution equations and ordinary differential equations of P-type;Ablowitz;J. Math. Phys.,1980
2. Hydrodynamics—A Study in Logic, Fact and Similitude;Birkhoff,1950
3. The general similarity solution of the heat equation;Bluman;J. Math. Mech.,1969
4. Symmetries and Differential Equations;Bluman,1989
5. Exterior Differential Systems;Bryant,1991